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Old 12-23-2022, 06:05 PM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,293
Crank, but no start, '88 190E 2.6

It has spark, but I cannot hear or feel the fuel pumps energize briefly when the ignition switch is turned on to just short of the start position.

The car has been in storage for the last 10 months as it has been many times in the past 30 years, but this is the first time the engine wouldn't start right up after hibernation. The fuel tank is full.

I suspect the fuel pump relay. I believe it's the first rectangular section relay behind the battery, just ahead of the KLIMA relay. I want to pull it out to check pins, but can't get it out. There is a locking tab on the front side, that I am able to disengage, and I suspect the rear has one too. Since the KLIMA relay is nearly touching I've been using a .035" feeler gage between them to try to unlock the tab, but no luck.

It's the original part with the following ID data:

003 545 00 05

KR0003 KPR

05 8956 70

Is this the fuel pump relay, and does anyone have a trick to remove it?

Also, I recall there's a way to short a couple of pin receptables with the relay removed that will energize the fuel pumps. Does anyone remember this, and maybe have link?

Duke
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