Having problems with your 1997 Chevrolet K1500 ?

Electric fuel pump comes and goes. Has left me down a few times. Seems like my problem may be electrical. Looking for some trouble shooting answers before dropping the tank or pulling off the bed. HELP!!!

Posted / edited by AnonymousUser on : 14-09-2020

Answers :

Have you checked the fuel relay in the ECM fuse block under the hood? There is a fuel relay that sits in there that can cuase the fuel pump to mallfunction. The solenoid ( a piece of metal actuated by electric current) can get stuck if the relay is going bad causing the pump to run continuously or not at all.. Sounds like yours is on the verge of failure with intermittent issues. That is the first troubleshooting I would do. On some models the same relay is used for AC and FUEL.. Meaning same relay type, not same relay. If you have AC you may be able to test by pulling AC relay and putting in FUEL relay spot. They are both ECM B relays. if you dont have AC and/or they are not the same. The investment in a relay is about $30 dollars and worth the time before all the labor of the alternatives. Also if you have to drop tank or pull bed, dont do all the work and try and save money on an ebay pump. I see it all the time. Buy a quality OEM pump, filter and sending unit assmebly and replace all while in the process. Otherwise you will develop fuel pressure issues (lack thereof) and will have running issues. The fuel pressure on your truck is required to be at 60psi for the injector and throttle assembly. (note.. the 97 came both carbeurated and injected dependin on if w/t model, etc) Moving the pump in the tank is going to dislodge dirt and items that settle on teh bottom of the tank. SO taking off bed may not be the best approach.. will be easiest of the two HARD fixes.. but Ive also seen a lot of replacements fail or go bad in short order due to the pump filter (not fuel filter but pump filter in tank) get clogged from dirt dislodged by not flushing tank and cleaning during work. Sounds like you know what you are doing on this and are going to do the work yourself. If it gets to that point I suggest www.gm-trucks.com for detailed instructions and others that have done the tank cleaning and work.
There are a couple of things that can be happening here. One is that your pump is failing. Often the pump will work ok for a while but then loose pressure as the fuel in the tank warms up. The second is that the internal connector located on the bottom side of the fuel pump/sender support unit could be bad. Look for a dark brown or blackened terminal where the harness from the fuel pump attaches to the connector that is part of the support. If you see ANY discoloration at this connector then replace the support, Don't try to clean or fix the connection as it will fail again withing a matter of days. Also if the connector is bad replace the pump too as it is being starved for current which shortens their life considerably.
Repair Help & Product Troubleshooting for 1997 Chevrolet K1500

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