Fuel pump relay

PMFUN81

MEMBER
1993 LEXUS LS 400
150,000 MILES

Where is the fuel pump relay located? I checked the fuel pump and it is fine. I have been having a hard time with it for a while. It ran before, but was very jumpy at times. I use premium gas and it runs okay, but it just decided not to even start one day at all.

2 Replies

HMAC300

MECHANIC
48,601 POSTS

Check fuel pressure first should be 38-44 psi with vacuum line disconnected from regulator auto parts rent gauges fuel pump relay (EFI) is on right inner fender.

Here is a guide to help check the relay with the location of the relay in the diagrams below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

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Thursday, October 31st, 2013 AT 3:26 PM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Here is a wiring diagram for the fuel pump so if you find the is controlled by a fuel pump module. Start your testing there. Here is a guide and some fuel pump wiring diagrams to get you going.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please let us know what happens so it will help others.

Cheers, Ken

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