I have the same problem. Replaced in tank fuel pump twice within a 2 month period. Truck died again. No fuel to engine. All wires, plugs okay. I don't know what else to do. Any one with ideas, please help.
An expert who has achieved level 3 by getting 1000 points
An expert that got 20 achievements.
An expert that got 10 achievements.
An expert that got 5 achievements.
Re: Fuel pump problem
If you run tank very low often, it can shorten pump life (don't know if you do) If voltage to pump is correct and system is not overcharging or spiking, check the ground for the pump...If it's not very good it will cause the pump motor to overheat from resistance. (Make a separate direct ground if unsure of condition.) I'm sure you wiped down the inside of the tank and it's very clean inside and you changed the filter when you did the pump???
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need. goodluck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
A relative of mine has a '97 GMC 1500. 2 years ago I spent several weeks chasing gremlins on it. Replaced everything - plugs, wires, ICM, TPS, and some other items. How many miles on your truck? It should fire within 1 to 3 turns of starter engagement. I have to ask, how do you know there is no spark or fuel when the engine does not start? Have you checked fuel pressure? Our trouble ended up being the fuel pump. We pulled the bed off the truck and found that the lines and wires at the top of the tank were severely rusting and eroding. I would have never guessed this kind of degradation due to the fact that the truck is so well taken care of. Check your fuel pump and tank thoroughly. Also check the tank filler neck and vent. If it runs for 15 minutes then quits, sounds like the fuel pump might be cutting out. Will not hurt to check and may save you time under the hood. I have poured over those electrical diagrams for the GMC. Alot of things tied into keeping those engines going nowadays. Let me know how things work out. GC.
This sounds familiar to me. I assume you replaced the fuel filter, if not, do so. Anyway, the same thing happened to be and I made it to the garage somehow and they said it was the pump, located inside the tank. 3 days later I picked it up and paid $350.00. It happened again a month later and I had it towed home ( the service garage changed hands and would not honor warranty). I unbolted and unstrapped the gas tank with a jack under it. The gauge said 1/4 tank so I figured on 40 lbs of fuel plus the tank.....wrong.... The tank was empty and the fuel pump had never been replaced. I has just never run my tank down that low before, so I had no way of knowing the gauge/float was miscalibrated. You never know....
Fuel injected or carb? Make sure fuel line itself is clear. Some pumps are designed to self regulate (carb systems) some continually pump and a psi regulator sends back the excess fuel back to the tank (fuel inj systems) If the line is obstructed then pump can't deliver fuel fulltime.
If you think pump is not on consistent, try running a dedicated wire through a switch directly to the pump. If it works then you are looking for an electrical fault going to pump. Good luck.
The fuel pump inside the fuel tank might have a bad armeture or brush failure. Have someone crank the engine with the key inside the vehicle while holding foot on brake pedal and e-brake on.
Take a large hammer and bang on the bottom of the fuel tank while the engine is cranking. This should wake up the pump. This is only a temp. fix if the truck starts. That was a sign that the pump has failed and should be replaced.
the gas gauge contacts get corroded by the chemicals in your gasoline over time, the only way to fix that is to replace the fuel sender unit...unfortunately the sender unit is usually incorporated into the fuel pump. fuel delivery problems like you describe could be clogged or dirty fuel injectors...if it's dying out on you as you drive it probably is indeed the fuel pump...usually an expensive fix. try an auto wrecker to find one for about 100 bucks.
You need to take a pressure and volume measurement, most fuel pressures for a carburetor engine are 3 to 7 psi, then you need to make sure the volume is consistent for a period of time, 20 to 30 second of engine cranking while the fuel is transferred to a container of some sort, make sure the ignition system is disabled to prevent you from blowing up the property.
I would check the fuel lines themselves and make sure there is no blockage. If not you might want to check your fuel injectors and see if they need to be replaced. also make sure you didnt install fuel filter backwards.