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bought a truck site unseen and the fuel pump wont come on so i was going to try and bypass the relay to see if the pumps worked befor i spent all the money for two in tank pumps but im open to sugestions on how to figure out how to find the problem of why there is no fuel to the throttle body. and is there any were to look at wiring diagrams and repair manules online

Tim, Just about any relay can

Submitted by Big Block 409 on Sun, 10/16/2011 - 04:15.

Tim,

Just about any relay can be jumped. The question is not can it be jumped, the question is why do you want to jump it. The relay is there as "Circuit Protection". What exactly is the problem? Don't buy or replace any parts until we have an understanding of what the problem is.

ouble shootingi bought a

Submitted by tim_69 on Sun, 10/16/2011 - 16:16.

ouble shootingi bought a truck and neither fuelpump will come on (i dont get any fuel to the engine or hear any thing when i turn on the ignition.the guy i bought it from says it is the relay for the fuel pumps and i cant find a wireing diagram or anything on trouble shooting this problem.So any help i can get would be very helpful

Tim, This link should help.

Submitted by drivability on Sun, 10/16/2011 - 17:25.

Tim,

This link should help. Register at autozone.com. Lots of free info there.

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0996b43f8038ecd6

You might already know about the third pump but you only mentioned the two low pressure in tank pumps and didn't mention the high pressure inline pump. In addition to checking the relay you might want to check fuses and fusible links as well as checking the tank selector. Also, make sure you don't overlook the inertia switch. Your problem might be solved by simply pressing a button. The good news is that three faulty fuel pumps is not all that likely :-)

Post back here with any other questions. We'll be glad to help. Thanks.

Tim, The fist thing to do is

Submitted by Big Block 409 on Mon, 10/17/2011 - 01:53.

Tim,

The fist thing to do is to determine that the pumps themselves are good. Do that with the cars battery. Make up jumper leads that can reach from the battery to the pumps. Give each pump direct voltage and ground. Any pump that doesn't energize immediately has to be replaced.