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Old 08-01-2003, 08:59 PM
Registered User
Join Date: Nov 2001
Location: Atlanta, GA
Posts: 553
Hot fuel pump relay

Well I have been having stalling problems on an 89 300se and I think I have narrowed it down to the fuel pump relay. I removed one of the fuel injectors to have a look at the spray pattern. I cranked the engine and there was a 15second delay before the fuel started to come out of the fuel injector.

I went to remove the fuel pump relay and it was very warm to the touch. Does this most likely mean that I have a bad fuel pump relay?

The car will not run at all anymore. If I crank the car long enough, it backfires, which worries me greatly. Any help is greatly appreciated!!!
George Carstens

Last edited by Maddog; 08-01-2003 at 11:19 PM.
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Old 08-02-2003, 03:50 AM
Registered User
Join Date: Apr 2002
Location: Surrey, Uk
Posts: 254
Sounds like the relay. You can jump terminals 30 and 87 and the pump will run. If the car starts then relay is bad.
Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)
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Old 08-02-2003, 09:45 AM
Registered User
Join Date: Oct 2002
Location: Toronto, Canada
Posts: 700
Had a very similar probelm on my w201. The fuel pump relay started overheating after I washed the car and some moisture got inside it. It caused the car to shut down in the middle of the road for a few minutes until the fuel pump relay cooled down, then it would restert and go a bit more until it overheated again. Very annoying.

replaced the fuel pump relay and the problem never came back.

1985 190E 2.3L - a constant project.
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Old 08-02-2003, 10:55 AM
Registered User
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
Don't overlook the filter ..
A clogged filter will cause the pump to draw higher than normal amps, resulting in a heated relay ..
If the pump does run, an amps draw test would be the next step..This can be done at the jumper MJ mentions...
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