Question about GMC Cars & Trucks
We've replaced the distributor, the pump, the relay, the computer, and still no luck. There is no power getting to the relay itself. We pulled out the pump to make sure it wasn't just a dud, but it's working fine. So we're back to square one here. Any ideas? I saw somewhere that we should check for an ignition fuse? But I can't even find where that is. Any help would be much appreciated. Thanks.
Look on the firewall above the ac for a black cover, remove it... I cant remember if they still used them or not but they're called fusible links.... Fuses made of wire smaller than the main wire. these links are designed to blow in the even something causes the wire to overheat...
Posted on Dec 30, 2013
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Posted on Jan 02, 2017
I assume the fuel pump fuse is good?
The only time voltage will be sent to the fuel pump will be the first 2 to 3 seconds if the starter is not engaged. You will want to crank the engine over and check for voltage on the load side of the relay, circuit #30 at the relay.
Let me know after you check.
Posted on Feb 23, 2009
SOURCE: No fuel or power to fuel pump.
If the relay is not getting ground signal to turn on then it sounds like a problem with the ECU this is fed from there. Commonly dry solder joints inside the ECU can cause this problem, they have a tendency to crack around the transistors and heavier load components and also components that are subject to mechanical vibration. He said that the fuel pump relay is located in the kick panel and the ECU is next to this. Id take out the ECU and remove the main circuit board and examine for dry solder joints. If you don't know what they look like its somthing like this http://www.tegger.com/hondafaq/mainrelayoperation/dry-joint_small.jpg
Hope this helps
Posted on May 08, 2009
I've been bitten by this twice! The culprit both times was the connector plug under the van infront of the fuel tank. the second time the connector pin and socket came loose inside the plug itself,( workes for a while then dosen't). Make sure there is good secure contact made in all sockets in this plug, and the pins are held where they need to be inside the plug itself.
Posted on May 29, 2009
switch the fuel pump relay with another on in the realy box. see if you hear the pump come on when you turn the key on (should run for 2 seconds) if not, have someone rap on the bottom center of fuel tank while you are trying to start the truck if it starts, the pump is bad and you will need to replace it. if you hear the pump run and is doesnt start, it may be a spark problem , verify if you have spark. this engine needs 58-62 PSI fuel pressure, if it has 55PSI, its not going to run.
Posted on Sep 27, 2009
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