1986 190E isn't gettin fuel from distribution - PeachParts Mercedes-Benz Forum

slk230red · #1 05-01-2009, 09:57 AM

Quote:

Originally Posted by 2020pup

yeah slk230red, i removed that filter and checked it. It wasn't blocked. The fuel accumulator diaphram has not been checked. How would you test it to see if it was good or needs to be replaced? And also thinking about it, that filter was on the return side of the distribution. Is that the correct side? I was kinda baffled on why it was on the return and not the feed side. Maybe you could enlighten me on that. Thanks

The Fuel Accumulator is on the return side because it has a diaphram and spring inside to hold fuel pressure so the engine re-starts quickly. If the diaphram/spring is defective, fuel will bypass the diaphram and return to the gas tank via the rubber hose attached to the rear of the Fuel Accumulator.

You might try pinching off the hose or disconnecting the hose on the rear of the Fuel Accumulator and blocking the rear outlet with a short hose and blocking it with a bolt and clamp.
Then try checking the fuel pressure to see if it is higher than the previous 16psi.

Just a thought without buying any parts to see if you can isolate your low fuel pressure problem.

2020pup · #2 05-01-2009, 05:38 PM

Ok that sounds like a good plan.. Think I'm going to "walk away" for today. Get back on it Saturday so I post my results.

2020pup · #3 05-04-2009, 08:50 PM

ok back with my results. I was going to plug the accumulator off but decided to have my wife cycle key while i was under just to make sure. Wouldn't you know it the line from fuel filter to rail had a leak. I moved it by accident and fuel shoot out. I replaced it and did the same as before this time for sure no leaks. I checked the pressure at cold start and have 80psi (and purge)while cranking and with key off it is holding 42psi steady.The car will start and stumble around like it wants to run but it won't stay running. You can kinda work the throttle but it still acts like its not getting enough fuel. LMAO we're getting closer!! Throw me some more ideas......please...... oh and by the way the ole wife has stopped giggling at me now since she heard it start anyway..still debating if I'll let her ride in it LMAO

slk230red · #4 05-04-2009, 09:08 PM

Sounds like you're making progress.

Is the fuel fresh?

Before spending money on parts, I would check the Idle Control Valve. Make sure the hoses on both ends are in good shape and are securely connected (they get hard and brittle over time).

2020pup · #5 05-04-2009, 09:40 PM

I put two gallons of fresh gas in it. Should i put more? I know it supposed to have a two gallon reserve but i do have the rear jacked up so not sure if that might have a little effect on it. On the idle control valve, it runs toward the radiator and down to a little plastic like check valve kinda on the backside, Right?? I checked the connector (to the check valve)to see if it was getting power and it is, but not sure if it is working or not. Does it hum or anything when the key is on or what.? I know I keep wearing you out with question but you seem to be my only "lifeline" on here. lol