My husband's 1990 Jeep pioneer will turn over but will not start. He replaced the fuel filter and it ran that day but would not start again a few days later. He replaced the fuel pump and it ran a few days. He drove it to work but when he came out it woiuld not start again. Help!

When you run out of fuel you
sometimes ruin the fuel pump

I would have thought you would have
said if you checked fuel pressure at least

Can't have a clogged fuel filter as you change that
every few years

Need to have your fuel pressure checked just because you can hear the pump going on doesn't mean it's running at adequate pressure

Other possibilities are a blown ignition module, bad coil wire, or broken cam sensor (it's attached to the distributor). There are detailed tests for these in the Bentley, but your mechanic ought to be able to troubleshoot.

This is presuming it's really a no-spark failure. Ground or power faults can disable the computer, the fuel pump circuit can be open, etc.

you have a fuel pump relay . Check to see if the fuel pump is humming when you turn key. check for proper ground for fuel pump. try spraying some carb cleaner into the intake then attempt a start. The engine will run for a few seconds, this will verify spark. corosion at the electrical connections is always a possibility. and lastly can you get the engine running by opening the throttle when starting?

you may have an air lock you need to bleed your fuel pipe by this i mean loosen the fuel pipe with ignition turned on not engine running you will see fuel coming out of the pipe at this point lock the fuel nut off. this should sort it out if not check to see if the fuel filter is saturated with fuel end fuel is getting to and threw the filter.

WELL DID YOU REPLACE FULE FILTER BUT ANY WAYS THE DO YOU HAVE 4.0 0R 5.2 IF YOU 4.0 THE COIL COULD BE THE PROMBLEM OR THE PIC UP IN DISTURBITER IT HALLFEC TYP OR IT SOUNDS LIKE CRANK SENSOR ON THE BACK OF BELL HOUSEING LOST OF PROMBLEM WITH THE CRANCK SENSOR HOPE THIS HELPS

by running out any debris in your tank will get sucked into your fuel pump. REplacing the fuel pump usually means removing the tank. You can try replacing the fuel filter first its much easier and cheaper. The filter is attached to your fuel line between the tank and the engine, usually in the frame. TAkes about 15 minutes to replace.

does your jeep run rough? idle is real low? and when you are driving and push the gas hard it doesnt want to move? if so it is most likely the mass air flow sensor. i had to replace that 2 or 3 times on my 1999 jeep cherokee

if you have an electric fuel pump that would explain the hum. unhook your incoming fuel line and blow the line clear, sounds like you've got some junk in your tank.it'll build up on the screen in the tank then fall off (at least partially) when your making turns or hitting bumps or holes. next time it's only got a gallon or so of fuel i'd drop the tank and check the pickup tube inside. sux but that's the only way to get to it. while you've got the tank off and out from under the jeep, might as well clean it out real good and replace anything inside (usually the screen) that doesn't look right, dirty etc. wouldn't hurt to run a bottle of fuel system cleaner in the next full tank of fuel either. preferably as soon as you put your tank back. good luck

Crank position sensors are a big problem in these vehicles. Scan the Jeeps computer and post any codes you come up with.