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Hello everyone i own a 1991 w124 300e and i daily drive it recently an issue started with the car when it runs ok for about 10 min then it stalls and wont restart again (p.s before stalling it starts running visibly rich it hesitates when i push the throttle black smoke before this phase the car runs perfect) i suspected the fuel pressure regulator changed it but no luck and i can hear the fuel coming back to the tank when i turn the key before ignition, plus there is a huge amount of fuel pressure that leaks when i try to remove the EHA not a small skirt but an amount of pressure that keeps going for a minute maybe more when i loosen the EHA add to that i can hear the fuel pump pushing hard, i have multiple theory and will start to work on them
1. The cold start injector leaking thus running ok for a while till its flooded
2. I have 2 fuel pumps should i try and disconnect one of them maybe the pressure is to high for some reason
3. The fuel distributor is faulty and needs to be changed
Any help or input is much appreciated
190E 2.6L 1989, 190E 2.6L 1988, BMW 535dXdrive 2014, BMW 428i 2015
1. The cold start injector leaking thus running ok for a while till its flooded
dolucasi>>> I very much doubt this. Not a common failure mode but easy to test by removing and observing. 2. I have 2 fuel pumps should i try and disconnect one of them maybe the pressure is to high for some reason
dolucasi>> I would not do this. The pressure is not regulated by the fuel pumps. It is not their fault that the pressure maybe too high and both are needed to run the car, one is not enough.
dolucasi>> You already changed the FPR so that should have solved a high pressure but if you believe there is too much pressure you can not wing this diagnosis and throw parts at it.
dolucasi>> You need to spend $110 to buy the correct fuel pressure gauge meant for our cars with the correct couplings and fittings an a switch valve with 2 connections. 3. The fuel distributor is faulty and needs to be changed
dolucasi>> It could be, but you need to measure the fuel pressure first. Also your EHA valve could be faulty. They tend to leak before fail operationally so a smaller probability but something appears to be building pressure or keeping pressure after the engine is off, but with the fuel pressure gauge you will witness this too.
dolucasi>> So my advice to you is to buy the pressure gauge before doing anything else.
dolucasi>>> The one and only time my car had similar symptom to yours was when the FD went bad and had to be changed. I am the original owner of my car. the FD was changed at 150K miles. Car never sat and was used regularly. Currently mine is at 207K miles.
dolucasi>> How many miles on your car????
Any help or input is much appreciated
I bought this for ~$110 online a few years back Control pressure System pressure
Thanks for your reply ill try to get my hands on the proper tools, im suspecting things like the cold start valve cause of the very bad fuel we had in our country the past 3 years so i think something somewhere is jammed or blocked, im well above 700k km we drove it a lot (daily use) since we bought it back in 2004 but the meter is stuck at 400k years ago didnt try to fix it but im planning on doing a proper restoration once i solve this problem ill keep you posted once i find the solution cheers
190E 2.6L 1989, 190E 2.6L 1988, BMW 535dXdrive 2014, BMW 428i 2015
There are multiple filters that would not allow larger particles to get thru and clog up things, but bad fuel, especially stale fuel is certainly not good for the fuel system in these cars. Once the fuel starts to turn into varnish you are in big trouble.
The dual input fuel pressure gauge is your friend, try to find one if you can in your country.
Congratulations on getting to the ~700K Km milestone
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