I have a 93 190e with the gas 6 cylinder in it, it has about 120,000.Here is my problem!When it get at running temp & I turn it off & let it set for 10 min or so it wont start it sounds like it is starving for fuel after 10 min or so but after it cools back down it will start back up after pumping the gas & holding it to the floor this problem started out minor 6 months ago & here I am now! I just changed the fuel pump,fuel filter & the fuel accumulator.Back in March I changed the fuel pressure regulator that is on the fuel injection system.I need help guys this car is slowly breaking me & it has left me stranded more than once.Thanks

This system needs a pressure guage to check all the system pressure settings.
There must be at least 35 psi after 10 minutes with motor off.

If less, the primary suspect parts are...Accumalator....Fuel pump check valve.

There are other pressure tests for rest/run/upper and lower chamber.
Frequency valve % setting is critical too.

Check air flap in Fuel Distributor for binding against the side of air funnel.
There are internal rubber O rings that can leak too.


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going to check that out today.my truck had a vaccum leak just got it fixed last week it was acking the same way.you said something about the fuel pump check valve were is that located at? thanks again scott

That sounds kinda like 2 different possiblities. First is checking the fuse on the overvoltage protection relay. USUALLY this would be more of a cold-start problem, but have seen them act this way hot a few times, and heck it cost $0 to check it. Second possiblity is the fuel pump relay, these can act up especially when hot, and would be something you could just try jumping just to check it out, no need to just go buy one to diagnose it. Other than that check the plugs, maybe someone has screwed with the mixture and it's way off and you can look for wet plugs, and make sure they are the right plug and gap too.
Gilly

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Jumping pins #7 ( Terminal 87. ) and #8 ( Terminal 30. ) are the 'Pump run' pins in the Fuel Pump relay socket.

These pins are next to index pin in center of socket.

The relay functions are = Activate f/p pre-crank....RPM limitation for max engine speed......Switch off f/p if no ignition pulse detected.......Kick down cut out.....Start valve activation.


By jumping these two pins you can go back and lay down near rear axle and should hear pumps running.

Fuel pumps should run for 1 second when ignition switched on if relay is okay.
They then run when hearing an ignition pulse with engine running.



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"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."