- 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.
Make sure you get a fuel pressure reading to know if you need to replace the fuel pump assembly...it should have 43 psi reading. If it is bad the fuel filters need replaced too. A fuel pump should never be ran lower that a quater of a tank because it kills the life of the pump, it acts as the pumps cooling system. Check for spark and see if there are any engine codes like a bad crank signal. Good luck
Possible fuel pump failure. Gasoline is used to cool and lubricate the in tank fuel pump. Running a vehicle out of fuel is not good for the pump. Try banging on the tank with your fist while someone cranks the vehicle over. If the vehicle starts or tries to start, suspect a fuel pump problem
Is there any fuel? Running a fuel injected vehicle out of gas is not good for the fuel pump as the gas is what is used to lubricate and cool the pump. If fuel pressure ok? Try banging on the tank with your fist while someone cranks the engine. If it starts or trys to start, suspect a bad fuel pump
If it cranks at normal speed, it could be the fuel pump or loss of spark. Autozone has a loan-a-tool policy. Pretty sure you can borrow or rent a fuel pressure gauge to see how good your pump and fuel filter is. Just hook it up to the test port on the engine's fuel rail, and turn the key to on, not start. It should immediately show about 40 pounds of pressure- 40 psi. If it is good, then it is probably an ignition problem, and you need to check for spark on a spark plug wire.
If the test shows no pressure, then the pump may be bad. It is not turning on, for sure. A final check before replacing the pump is to check that the pump power wire at the fuel tank connector has power on it with the engine cranking over. If it has power there when cranking, the pump circuit is good (all fuses and relays good). The fuel pump itself is the problem.
On that model jeep, if it is a Cherokee Sport like my son's '95 jeep, it is quite easy to change out a fuel pump. You don't have to drop the gas tank to replace the pump. The assembly goes into the gas tank at the front upper part of the tank, above and just back of the rear differential. I changed out the fuel pump on his jeep in a K-mart parking lot in a little under 2 hours. Wiggling and twisting the assembly out of the gas tank hole for removal was the most time consuming part. It was really quite easy. If you have ever replaced a pump before, .the jeep is a breeze.
No crank to a mechanic means the starter motor doesn't spin the engine over, is this what you mean? Or do you mean the engine cranks over but will not fire up and run? If it is the latter have you added at least 3 gallons of gas to the tank to make sure the electric fuel pump inside the tank can properly prime? If not do that, also you can spray starting fluid into the engine engine air intake pipe after adding the 3 gallons and see if that gets it going. If it still will not start you have burned up the fuel pump and you will need to drop the fuel tank and replace the pump, remember the pump is cooled and lubricated by the gasoline it runs in, so when you run low on fuel or out you can very quickly severely damage the small electric fuel pump. Never let the gas gauge level go below 1/8 tank to prevent premature fuel pump failure.
Check for pressure at your fuel rail, If your fuel pump is working correctly you should be getting fuel spraying out of the rail when you press in on the needle valve (sometimes covered by a small cap)
This will let you know if your fuel pump is working, and at least if fuel is making it past your filter.
I have seen many fuel pumps go bad on these cars. If you can get an assistant to crawl under car and pound on fuel tank with rubber mallot while you crank the car and it starts it is the fuel pump. replace asap
if its petrol engine bang bottom of fuel tank while some one else cranks vehicle over if it starts good just pump jammed if it dont buzz to life and you cant hear fuel pump buzzing ceck for power to it if thats there replace pump. running out of fuel kills electric fuel pumps internally in petrol tanks.
if its diesel you must bleed fuel system taking extreme care if you un do lines some very high pressure
Check the fuel pump fuse, (20 amp yellow fuse in the lower left corner of the group). If that is not blown, turn the key on and pound hard on the bottom of the fuel tank. The fuel lubricates the fuel pump, once it runs dry, the pump can lock up. Once the pump is immersed in fuel again, a sharp jolt will unstick it and let it pump up to pressure again. If it locks up for too long, the pump will burn out and need replaced.
We found this out by accident, got mad and pounded on the bottom of the tank and the pump jumped to life.