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Thread: 560SEC & 560SEL Fuel Pump Relays NLA from MB

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    560SEC & 560SEL Fuel Pump Relays NLA from MB

    I have it on good authority that the fuel pump relays that were used in 560SEL & 560SEC models, are no longer available from MBUSA.

    The part number for these relays is 003 545 25 05.

    There are aftermarket versions available, but these are not nearly as reliable as the factory units were. Example of aftermarket parts: http://www.autohausaz.com/search/pro...ber=0035452505

    It is HIGHLY advisable to get used factory units from the wrecking yards.

    The 1986-1989 US models originally used a different fuel pump relay part number, which was 003 545 01 05. This part was superseded to the above part for the 1990 and 1991 models, 003 545 25 05, some time back.

    Cheers,
    Gerry


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    E500E Guru RicardoD's Avatar
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    I will be a doing a pick-n-pull run on a W210 soon, where are these relays located? How easy to pull?
    RicardoD
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    W210 does not have these relays.

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    I meant to say I have to do a Pick-n-pull run on a W210, and if I encounter a 560 in the lot, then this is my opportunity to pull a relay.
    RicardoD
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    I'm pretty sure that it's up on the false firewall by the brake booster on Gen2 cars.

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    They are very often already taken. The relay is located underhood, between the inner and outer firewalls, in the center rear area (just forward of the windshield wipers). When underhood, just to the left of the brake booster area. You'll see it. The Klima, Fuel Pump and OVP relays are clustered together there on US 420 and 560 models.

    It's advisable to get all three of these, at least to have a couple of spares of each on hand. Often they have been replaced with aftermarket KAE relays. When I see this I just leave it; I only get original MB relays from the parts cars in the yard.

    Also, for the fuel pump relay, it's HIGHLY advisable to carry one of your spares in the trunk inside your spare tire tool/emergency kit. Reason being is that you are dead in the water if your fuel pump relay fails in the field, unless you know which of the two pins to jumper. The problem with this is that jumpering things will cause the pumps to cycle continuously until you remove the jumper or disconnect the battery. So it can get you home, but you have to remove power until the relay gets replaced.

    Carrying a spare fuel pump relay in the trunk is an easy fix, and takes all of 45 seconds to replace.

    The symptom of a dead fuel pump relay is the engine won't start, but will sit and crank. Often it happens that the relay is fine when it cools down, but after operating the car for a few minutes, the weak/broken solder trace inside the relay separates, removing juice. So, you're tooling along just fine and then your car conks out, and you can't get it started for a couple of hours until things cool down and the solder trace re-establishes connection. Less often, it just fails while the car is parked, but my experience is that it fails when the car is warmed up.

    Lastly, there is one other important relay on 560s. Sometimes I see them removed, but often because of their location, they are still in place. It's the idle speed control relay, and these are located in the inside passenger footwell, mounted up against the inner firewall up under the dashboard. This relay regulates idle speed and is part of the engine/fuel control system. It's a different part for the 420 and 560 engines, so be sure to ONLY get one from a 560. They don't go out, but good to have one or two on hand as spares.

    Cheers,
    Gerry

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Wonderful info Gerry. Thanks.
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    I carry a spare fuel pump relay but also made this as a failsafe. It's just a continuous length of coat hanger with banana plugs soldered on. Fits perfectly to jumper pins 7 and 8 to make the fuel pumps run.




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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    We have been re-manning the OE relays to good avail here.
    72$ w/ shipping but I NEED your old cores back!

    FWIW, a large paperclip will get you home..or a piece of speaker wire... Yes, I've pulled speakers to get at a piece of wire while stuck on the side of the road.. Even took apart a key chain to make an impromptu jumper once. Isn't stupid if it works..

    jono
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Quote Originally Posted by jhodg5ck View Post
    FWIW, a large paperclip will get you home..or a piece of speaker wire...
    Yep, that has always been my solution.

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Would this be the same relay for a 1987 560SL?

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Quote Originally Posted by skikrazey View Post
    Would this be the same relay for a 1987 560SL?
    the numbers vary some but they all work..all 560's/420's etc, etc...
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    91 560SEC ECE 87 Hammer Coupe, Sedan and Wagon 6.0L 32V 86 560SEL AMG 6.0L 32V

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Correct -- the fuel pump relay would be the same for any M117 5.6-liter engine (SEC/SEL from 1986-1991) and 560SL 1986-1989.

    I believe it will also work with the 4.2-liter M116 models on the W126.

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    It's better to jump terminals 7 and 9 , as #7 is circuit 87 to fuel pumps, #9 is circuit 15 which is only hot with the ignition on. terminal #8 is circuit 30 which is hot with the battery all the times. With #7 and #9 connected, the fuel pumps will cut off when the key is turned off. Of course this should be used only in an emergency till you can get a replacement relay.

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Quote Originally Posted by benzman70 View Post
    It's better to jump terminals 7 and 9 , as #7 is circuit 87 to fuel pumps, #9 is circuit 15 which is only hot with the ignition on. terminal #8 is circuit 30 which is hot with the battery all the times. With #7 and #9 connected, the fuel pumps will cut off when the key is turned off. Of course this should be used only in an emergency till you can get a replacement relay.
    Just a thought here, I would NOT use this method until I knew that the wire gauges and switching could support the current draw of the pumps without any overheating. In this particular case, the terminal 15 wire is merely a signal to the fuel pump control unit. It is not necessarily substantial enough to supply the operating current to the pumps. I have not looked, but if this is wired the same way as most automotive circuits, this terminal 15 wire will be a significantly smaller gauge in accordance with the smaller amperage it has to support, while the terminal 30 wires will be substantial. Furthermore, there is no reason to assume that whatever switching element controls this terminal 15 circuit has the designed in current capability to support the pumps. Overheating of the switching elements, such as the ignition switch contacts and/or possible relays, etc. could be negatively affected, in addition to possible overheating of the wiring, that I have already mentioned.
    Putting the fun in dysfunction...

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Klink, You are correct, the 15 circuit is about half the size of the 30 and 87 circuit wires. This is by no way a fix, just a very temporary get me to a shop or home, hope the hood release cable doesn't break or fail while it's hooked to the 30 circuit ! or be involved in an accident with front end damage on the way home or to the shop.

  26. #17

    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Also, anytime a jumper wire is used it should be a fused jumper wire no matter the circuit or what you are trying to bypass.

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Not a bad idea. So with the w or c126, a 10” lead on a 10a gm fuse would work, just long enough to extend past hood weather stripping for easy access to remove the fuse IF the hood latch breaks. .036 FPR below the rear psgr seat.
    1994 E500
    249/275 - 8F19 or 8F32 or 8320

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Trae
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Mission Trading Corp = absolute Chinese junk. Check the parts vendor quality list.


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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    OK
    Trae
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    1991 560SEC ECE/1995 E320 Cabriolet

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    MTC is a staple among denizens of other forums. But not here. We are better than that. Trust me.


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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Jono says to find cores, then send to him for rebuild.

    Or, carry 10 ga. wire, just in case.
    Trae
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    I came across the one brand new fuel pump relay I have from MB, but am “hoarding” that one and will use the numerous used ones I have if/when needed. In almost 16 years of SEC ownership, I’ve only had the FPR fail one time.


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    Senior Member vdubpower's Avatar
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    HI guys, thanks for this thread

    for my 85 500sec euro, is the KAe brand my best option for a FPR?

    apparently my car came to me with a URO brand one.....i think, but not sure...but this may be the reason it random turns off on its own while idling.....or while driving i have a sudden loss of power and revs drop and then it starts going again.

    i believe the part number is 0015455305


    ....i just noticed my 500sel 0015453405 as its part number

    are these interchangeable
    Last edited by vdubpower; 05-28-2018 at 02:43 PM.
    1985 MB 500SEL EURO NAUTIC BLUE
    1985 MB 500SEC EURO NAUTIC BLUE
    1989 PORSCHE 911 CARRERRA ANNIVERSARY EDT
    2012 MB E63 AMG
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Quote Originally Posted by vdubpower View Post
    HI guys, thanks for this thread

    for my 85 500sec euro, is the KAe brand my best option for a FPR?

    apparently my car came to me with a URO brand one.....i think, but not sure...but this may be the reason it random turns off on its own while idling.....or while driving i have a sudden loss of power and revs drop and then it starts going again.

    i believe the part number is 0015455305


    ....i just noticed my 500sel 0015453405 as its part number

    are these interchangeable
    The 34 05 part number is appropriate for a Euro-spec 500SEC/SEL/SE as well as a Euro-spec 380SE/SEL/SEC.

    The 53 05 part number is appropriate for a US-spec 500SEC/SEL and a 380SEC/SEL/SL.

    I believe they are 100% interchangeable and the 53 05 part will work just fine in your car, but if you can find a Euro-spec unit off of a gray-market car that would probably be preferable.

    I would NOT use a US-spec 560SEC/SEL/420SEL unit (which is part number 003 545 01 05 for 1986-1989 560s and 003 545 25 05 for 1990-1991 560s) in your car, though there is a remote possibility that it could work. I believe the 420/560 FPRs have more pins than the earlier ones for the 380 and 500s.

    A KAE unit in my opinion is not desirable, and I would only use it as a temporary, stop-gap measure until I was able to source the correct unit.

    Under NO circumstances would I use a URO Parts unit, because it could go at any time. At least a Kaehler unit could last a year or two.

    Cheers,
    Gerry

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    gerry, thanks for info

    ive been searching the internets and finding a genuine 3405 or 5305 is really hard. .. dealer sites list 3405 fir $300 but dont have in stock

    interestingly the 10 pin versions for 560 cars are so cheap, 30-40 bucks on dealer sites

    KAE is the only other brand ive found, and i hear your reservations but i think thats all i have to choose from realistically. The usa version is around 60 and the euro version is 100 from the usual parts websites...

    it list rpm 5850 on the euro and 5500 on the usa version. Im not really sure what this means big picture because im not redline driving these cars at all. Not sure if its worth the difference

    thanks
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    The 560 versions are NLA from MB, and as is often the case they dump the price immediately before they go out of permanent stock. And, it's been recent enough that they haven't removed the part number from their database, so it shows up as being available, but for like $35. But if you were to place an order, you'd get a quick response from the vendor that it is NLA from MB.

    So, either you find an NOS unit, or a used one, or you have to go KAE or URO. Though I believe that KAE is currently on back order. I bet if you looked at enough vendors, you could probably scare one up ... have you tried AutohauZ, Importec, FCPEuro, and so on? There's a certain guy who owns a shop in San Rafael who may either have an NOS or used unit specifically for your car.

    One of TFTSNBN 126 forum guys should have a used one too, I'd think.....

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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    yeah fcp and those places have them for 100$ for euro version or 60/70 for other

    i may get it from them because they have a good return policy if needed....
    1985 MB 500SEL EURO NAUTIC BLUE
    1985 MB 500SEC EURO NAUTIC BLUE
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    Quote Originally Posted by gerryvz View Post
    One of TFTSNBN 126 forum guys should have a used one too, I'd think.....

    is that code for BW
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    Re: 560SEC & 560SEL Fuel Pump Relays NLA from MB

    TFTSNBN = "The Forum That Shall Not Be Named"

    300RPM difference between the Yurro and US versions doesn't amount to squat. Like I said, I think a US version will work fine, and given the numbers of 380s out there (380SE, SEL, SL, SECs) you shouldn't have difficulty finding one.

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