ML 320 Hard start / Fuel rail pressure bleeds down
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ML 320 Hard start / Fuel rail pressure bleeds down - 6/23/2008 9:11:37 AM
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Fixit
Posts: 11
Joined: 3/16/2007
Status: offline
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1998 ML320 150K miles. Hot or cold the engine takes 10 to 15 seconds of cranking before it will start.
When I bleed the pressure from the fuel rail, there is a combination of vapor and gas.
Each time I bleed the gas vapor out of the fuel rail, the truck will start up normally several times before it again becomes hard to start.
The truck runs fine after it starts.
The check engine light is not on.
Fuel pressure with engine running 55 lbs.
When I turn the engine off, the fuel pressure will bleed down to near zero in 4 to 5 min.
Occasionally when the key is turned on, the fuel pressure will go up to 55 lbs. instantly, but most of the time the pressure will not come up until I start cranking the engine and even then it might not happen for several seconds.
From reading the forum I am under the impression that the fuel pump does not come on until the starter is engaged.
From reading the forum, I tried the following test which were successful:
When I turn the key to on position the red LED DAS light flashed.
Also when I turn the key to the on position and wait 5 seconds before turning to the start position the starter does engage.
I have tried three different keys.
I changed out the fuel pump relay but that did not change anything.
The dealer installed a new fuel pump and filter, and the problem still persist.
I do not think it is normal for the fuel pressure to bleed down after turning off the engine and since there is a new check valve in the fuel pump/filter change, my guess is that there is a fuel injector leak.
I have never pulled the injectors from this truck, so any diagnostic suggestions will be helpful.
I will appreciate anyone''''s thoughts about my problem.
< Message edited by Fixit -- 6/23/2008 9:20:20 AM >
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