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

  1. #1
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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 This part was superseded to the above part for the 1990 and 1991 models, 003 545 25 05, some time back.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
    1990 964 C4 / 1991 964 C2 tip
    1994 E500
    1991 560SEC
    2014 E350 for wife

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

    W210 does not have these relays.

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    E500E Guru RicardoD's Avatar
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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
    1990 964 C4 / 1991 964 C2 tip
    1994 E500
    1991 560SEC
    2014 E350 for wife

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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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  10. #7

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

    Wonderful info Gerry. Thanks.
    '00 E55 AMG
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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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    08 E63 05 E55 Estate 95 S600 94 SL700 93 500E Brumos/RTech 92 500E T/R 93 500E (122)
    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

    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...
    Blue Ridge Mercedes Jonathan Hodgman
    Mercedes Repair Atlanta
    http://www.blueridgemb.com/
    08 E63 05 E55 Estate 95 S600 94 SL700 93 500E Brumos/RTech 92 500E T/R 93 500E (122)
    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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  21. #14

    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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  25. #16

    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

    1991 560 SEC
    199/268
    2014 E350 Cab 799/264

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