My truck quit on me in my driveway coming home from work last night. It won't turn over, so I'm thinking it either the relay or the pump. Just wondering which to start with replacing, the relay or the pump, and where is the relay?

 

When you say "It won't turn over" do you mean that the starter won't turn the engine? or that the engine turns over but doesn't "fire"?

 

It won't fire. I sprayed starter fluid in the tbi and it seemed to want to fire up, but then stalled out.

 

I used to have a '94 Yukon. Trying to remember where everything was...
Is there a plastic box under the hood with a bunch of relays in it? Might be under the dash on the the driver's side.

Can you see fuel coming out of the throttle body while someone tries to star the truck? Might try checking the fuel filter as well. Should be on the frame rail somwhere.

 

I'll check the fuel filter in the morning before I go to the trouble of dropping the tank. I probably will drop it anyway since the gas gauge isn't working, have to replace the sending unit. Thinks for the help, I'll let you know how it turns out.

 

Ha! yeah it seems in my experience when the gauge started acting up the pump was soon to follow. Please tell me you don't have a full tank of gas>

 

Didn't have a full tank, in fact, I may have run it empty. There was less than a gallon in it when I dropped it. Just trying to find a good price on the sending unit. I found the sending unit and pump at rock auto for 86.00. For the sending unit, do the hoses that connect to the unit come with it or is that separate? And If they are separate, what are they called and where might I be able to find them?

 

I'd do a quick check through the forum about fuel pumps. Many people have had bad luck with anything but AC Delco or....bahhh brain fart.