1989 Chevy Suburban lost power to fuel pump circuit

AZWEAZEL71

MEMBER
1989 CHEVROLET SUBURBAN
V8
4WD
AUTOMATIC
94,000 MILES

Lost power to fuel pump circuit thought it was pump so replaced it as well as fuel pump relay, fuel/oil pressure switch as well as distributor and ignition module and ignition swtich still no luck. Plus injectors are not working as well and also replaced ecm. Plus now I have a battery drain situation through the ecm-b fuse what is powered by that fuse?

Sunday, August 16th, 2009 AT 7:07 AM

1 Reply

JDL

MECHANIC
16,098 POSTS

Hello, did you check the wiring circuits at the fuel pump relay before replacing anything? Ecm B for load side of fuel pump relay and ecm, don't see anything else. How much of a draw is there, the computer memory would draw some. My info says the battery draw shouldn't be more than 30 ma, .030.

When you turn the key on, do you have reference voltage at the TPS or any sensor that uses a reference voltage, whatever is easy to get at? Does the cel come on, when you turn on the key? Can you communicate with the pcm, check for codes? I'm just trying to find out if the computer is awake?

Make sure the battery has a full charge and all connections are lean and tight on both ends.

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Sunday, August 16th, 2009 AT 9:44 AM