When I carried out the 500TE conversion, I used the original "Wagon" fuel pump mounted at the tank which takes the fuel over the rear axle to the standard fuel pump. The Wagon had one pump at the tank and one in the normal place under the rear floor area.
I couldnt use the single wagon pump, cant recall why now, so I transplanted the 500E dual pumps. In effect I had 3 pumps now.
I thought it would be fine as the system has a pressure regulator up front anyway?!
Well the first time I turned the key, the front fuel lines exploded. In reality I had forgotten about the fuel pump setup that I h ad installed weeks/months before. The fuel pipes were very brittle under the braiding so just put it down to age.
Pipes NLA from MB so had them rebuilt locally.
This weekend I was under the car and noticed the short rubber hose from fuel filter to metal fuel line was showing some cracking.
I tried to measure fuel pressure with my cheap fuel pressure guage. It shot off the scale at over 10 bar.
So decided to put it back to how the 320 wagon was set up. So in effect I bypassed one of the pumps on the dual setup and disconnected its electrical connections.
Tried again and the fuel pressure is still off the guage. Hmm? Scratchy head?
I cant see what could be wrong. Each fuel pump is supposed to have a working pressure of 4 bar and a flow rate of around 100-120L per min.
I am tempted to just leave it now but worried that I may have more exploding fuel pipes and I have a longish drive next week.
What do you guys think? It seems its less than straight forward to calculate what pressure I should be seeing from two standard Mercedes fuel pumps plumbed in line.