Author Topic: Need help with a fuel injection pump  (Read 5854 times)

zdzich

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Need help with a fuel injection pump
« on: March 08, 2015, 02:56:49 »
Hello.
I'm looking for a good mechanic shop that can adjust a Bosch fuel injection pump. I have a 1968 Mercedes 250SE and I think the pump injects too much fuel because the engine runs very rich, it produces black smoke, and the oil is contaminated by the gasoline. Local places that service diesels don't want to mass with it because they are telling me that their equipment is only set up for certain diesel injection pumps. So, does anyone know any mechanic shop that could adjust and test the injection pump on a bench ? I would appreciate your feedback. Thank you.

ja17

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  • USA, OH, Blacklick
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Re: Need help with a fuel injection pump
« Reply #1 on: March 08, 2015, 04:25:52 »
Did you do any checks to see if the pump rack is stuck or the WRD is stuck?
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

280SEC

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Re: Need help with a fuel injection pump
« Reply #2 on: March 08, 2015, 19:59:40 »
Hi!

It seems to be a problem with the cold start parts f.e. the cold start valve or the thermostat on the f.i.p. You will find hints for testing in the workshop manual.

Greets Konny

zdzich

  • Guest
Re: Need help with a fuel injection pump
« Reply #3 on: March 09, 2015, 03:22:45 »
Thanks for your response. I removed all three covers and the solenoid to look inside for any visible problems. Everything seems to look good, nothing stuck, nothing broken. The parts that I could touch were moving freely. I suspect that at some point someone was trying to do adjustments. So, now I'm looking for an expert in this field to have complete check and adjustment done to the pump.

zdzich

  • Guest
Re: Need help with a fuel injection pump
« Reply #4 on: March 09, 2015, 03:24:27 »
Thank you for your feedback. I will check the thermostat.

280SEC

  • Guest
Re: Need help with a fuel injection pump
« Reply #5 on: March 09, 2015, 10:59:53 »
If the car works correctly earlier its a problem with the two things I mentioned. If this is an older problem maybe an owner turned the wrong screws and disarrange the pump. First you have to check the ignition and the gas linkage. Then make a CO-Test with 3000 RPM. At last you can give the pump to a Bosch-Service, if this is possible in the USA. In GER we have some specialists for the old pumps.