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-   -   fuel pump relay (http://www.peachparts.com/shopforum/showthread.php?t=211390)

OMEGAMAN 01-21-2008 11:02 AM
fuel pump relay
 
Does anyone know which terminal on the fuel pump relay gets a signal from the ignition system. I have searched and cant find the answer. 89 300e Thanks in advance

Carson357 01-21-2008 03:32 PM
usually will be circuit 15 if you mean ignition switch,

here is a link to an article that may help understand mercedes wiring

https://www.mbwholesaleparts.com/StarTuned/pdfs/Info07JuneST.pdf

865sp300e 01-22-2008 12:29 PM
Quote:
Originally Posted by Carson357 (Post 1738869)
usually will be circuit 15 if you mean ignition switch,

here is a link to an article that may help understand mercedes wiring

https://www.mbwholesaleparts.com/StarTuned/pdfs/Info07JuneST.pdf
That is correct, circuit 15 (pin #9) is the power input. If you wish to test the fuel pumps bridge relay circuits 30 (pin #8) and 87 (pin #7) which will send direct power to the pumps.

OMEGAMAN 01-22-2008 07:31 PM
I just re read my post. I was looking for the rpm signal input to the fuel pump relay.

865sp300e 01-23-2008 08:00 AM
Quote:
Originally Posted by OMEGAMAN (Post 1740120)
I just re read my post. I was looking for the rpm signal input to the fuel pump relay.
Relay socket TD is the RPM input

OMEGAMAN 01-23-2008 05:57 PM
Thankyou!


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