1999 4.3 Blazer Fuel Pump Problems

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Dec 28, 2009 | 07:57 AM

#11

sbrookover

Thread Starter

Joined: Dec 2009

Posts: 6

From: WV

No we have not checked that. thanks we will try. This has been a total pain in the rear..lol

Quote:

Originally Posted by TFisher

Have you probed the relay sockets for voltage to the coil? Might eliminate that possibility.

Hope this helps!

Regards,

Thomas

We checked the relay by using the one for the horn. Parts store told us it was the same one. Still no luck there.

Quote:

Originally Posted by mfd70

I had lots of problems getting a fuel pump replaced then getting it to run, now I know it sounds obvious, but the pump relay will go in wrong ! Its worth double checking its fitted correctly before chasing around in circles ! Also if your sure relay is working OK, you could just run a new feed to the pump.
Also there is something different in the wiring of the fuel pump/sender unit depending on where you buy it from. I didn't see mine before it was fitted so can't say what ! But now my fuel gauge reads OK, until I put the lights on, then it goes to empty ! But hey, at least its running (after a fashion) which it hadn't been for weeks !
o

We hot wired it with the battery charger ( 12 volts @ the pump) We did not try jumping it at the relay yet.

Quote:

Originally Posted by swartlkk

The fuel pump relay should not matter which way it is installed. That is by design.

to the OP, where did you hot wire the pump at? Did you try jumpering it at the relay? If so, then the rest of the wiring from the relay to the pump should be fine.

Last edited by swartlkk; Dec 28, 2009 at 12:34 PM. Reason: Combining Consecutive Posts - Please use the EDIT feature to add more information to your post if another member has yet to respond.

Dec 28, 2009 | 09:31 AM

#12

mfd70

Beginning Member

Joined: Jan 2009

Posts: 36

From: Quakers Yard, Great Britain

mfd70 is an unknown quantity at this point

This does remind me of the run-around I had with my fuel pump fault. The mechanic who eventually fixed it used a 60W load (a couple of tail lights in parallel) connected in place of the fuel pump to prove the relay, supply and grounds were all ok. After that he re-wired the replacement pump correctly (it wasn't originally and never worked) and we had fuel ! It does seem like certain types of fuel pump don't seem to last long on this model. I've been driving 20 years and never had a fuel pump go on any other vehicle I've owned (Ford,GM,Chrysler,Land Rover,BMW,Saab etc.)