i do think my fuel pump went bad on me, but i would like to check all the other possibilities before going through the hassle.

when i turn the key, there is no sound at all from the fuel pump. the fuse at the fuse block under the dash is good. im not sure how to check if the relays near the engine are good. not even sure which one is which.

i also took off the connection near the front of the tank, i believe that is the power for the fuel pump. it is a connector with 3 prongs. i checked it with a test light, both with the key on and off and still nothing. i tried to hook up the prongs going to the fuel pump to another battery directly to make it run but nothing.

can i use another battery to test if the pump is even coming on? which of the prongs need +, and - power?

thanks guys.

 

TZ,

The locations of some of the components are different depending on what model you have.

For Pontiacs, the fuel pump/ECM fuse and relay arrays are as such:





Chevrolets are as such:



But both are wired the same:



If you are trtying to test the fuel pump, you need to provide a 12VDC+ source (preferably fused) to the 'G' terminal on the ALDL connecctor unnder the dash.



Of course, the circuit relies on the ground at the tank to be intact.

 

wow, thanks.
so i now know what relay is what, BUT how do i know if its bad?
i think im just going to replace it anyway. it looked pretty greased up and nasty. i shot it with brake clean, and maybe ill use some dielectric grease.

i took a test light and checked the 3 prong connector coming from the trunk. used my remote start, and there was no light coming from any of the three.
i believe the black is ground, the gray is power, and purple is guage?

also, i used a battery starter and tried to turn the pump on using that. didnt do a thing, anyway i tried it.

so now im worried if i do replace the pump, it still might not be getting power.

and can i use a tpi pump on my tbi? cause i want to go to either an LT1 or a modded TPI later anyway?

thanks guys, and Vader, man you've been helping me with all the really hard stuff for it seems years now. THANK YOU

 

Weelz,

If you do discover a failed pump, you should be able to use a TPI/LT1 pump on your TBI. The pressure regulator will just dump the excess fuel back to the tank (just like it does now). At least you're planning ahead.

If you have no power at teh tank connections, I doubt that it's the pump. A new relay is only ten bucks or so, so if it's in question, you might as well. You could pry it open carefully at the edges of the can, and inspect it to be sure.

 

Wow thanks Vader I was looking for the same information:hail:

 

i first replaced the relay, still did not work. but it was only $10 and the original looked nasty.

i had to change the fuel pump, strainer, and filter. so all works fine now.
it was definetly not a fun project, but i had lots of friends over to help.
i ended up going with a stock replacment, next time it goes though. i want to use an inline high pressure unit, located in the engine comp.

thanks guys,