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Old 11-25-2005, 08:23 PM
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Join Date: Nov 2005
Posts: 1
Unhappy 190E fuel-pump relay power-source?

Ok, got the headgasket replaced that was fried due to stuck thermostat. Car was running fine at that time. Now that it's back together, I have spark but no fuel...

Tried pulling the fuel-pump relay and jumping pins 87 to 30 and still no fuel. Measured pin-87 and it SHOULD have +12v power right? The wiring diagrams in my Chilton manual sucks, but I could at least make out that pin-87 should go to the alternator then to the +positive on the battery. There's no power on this pin with the key OFF or ON.

Any suggestions?

TIA -danno

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Old 11-26-2005, 01:54 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
I believe that 30 is the power source (hot in start or run), and 87 is the output to the fuel pump. If you jumped 30 and 87 with the ignition on and the pump still didn't work, then your pump is bad or you have a wiring problem.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 11-26-2005, 10:52 PM
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Join Date: Jul 2001
Location: SoCal
Posts: 1,303
If you've checked your fuses, and they are old but appear fine, I would recheck them. Old fuses often have hairline stress breaks almost invisible at a glance. When such a fuse is pulled out, though, it usually falls apart.


'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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