Mechanics

WHAT WOULD CAUSE FUEL PUMP TO QUIT WORKING?

1994 Jeep Cherokee • 42,900 miles

I have a 94 cherokee sport 4.0 liter. With only 42,000 miles. While driving down the road one day it started to spit n sputter like it wasnt getting gas, I assumed it was a problem in the fuel system so I replaced fuel filter and fuel pump and I still have same problem. It will be running fine and then you can hear the fuel pump stop pumping and the engine dies. What the heck could be causing this?
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Piece o jeep
August 18, 2012.




If power supply is cut to the fuel pump, it would not work. You need to check the electrical circuits. It could be the relay, loose connection or a problem with the PCM.

KHLow2008
Aug 18, 2012.
WITHOUT KNOWING EXACTLY WHAT'S GOING ON.....AND MAYBE YOU ARE JUST MAKING ASSUMPTIONS AND SORTA GRASPING FOR STRAWS, TUNNEL VISION SOMETIMES TAKES OVER!

HAVE YOU DONE SOME ACTUAL HANDS ON TESTING WITH INSTRUMENTS???---LIKE.....WHEN IT IS "GLITCHING", WHAT IS THE FUEL PRESSURE AND DO YOU HAVE SPARK???

THIS KINDA INFO MIGHT TURN YOUR DIAGNOSIS AROUND 180 DEGREES (AND THEN AGAIN MAYBE NOT)

TAKE THIS POST AS AN EXAMPLE...DEAD IN THE WATER, THEN IT WOULD FIRE BACK UP LATER

http://www.2carpros.com/questions/2001-jeep-cherokee-stalls-cannot-restarted-random

JUST TO GET YOU TO UNDERSTANDING HOW I APPROACH MY JEEPS' EVIL ISSUES, THAT COME ABOUT FROM TIME TO TIME

http://www.2carpros.com/questions/2007-ford-taurus-tune-up

I JUST DON'T TRUST "WORD OF MOUTH" UNTIL I CAN VERIFY IT IN WRITING

AS FAR AS MAYBE NOT HAVING A MANUAL---I CAN PROVIDE YOU WITH ONE.

PERFORMING TESTS IS ALL A MATTER OF "ACTUALLY" CRACKING DOWN AND PERFORMING THEM...AND GETTING THE PROPER TOOLS/INSTRUMENTS NEEDED (MANY TIMES THEY CAN BE RENTED AT AN AUTO PARTS STORE, OR A "GET BY" VERSION MIGHT BE FOUND AT A PLACE LIKE "HARBOR FREIGHT", ETC

LOOKING THRU THIS MANUAL DOES TAKE A LITTLE PRACTICE TO FIND STUFF....THESE ARE THE FACTORY MANUALS, IF YOU HAD YOURS IN PAPER, I COULD SAY THIS IS THE BEST YOU COULD GET....SEE "ONLINE REPAIR MANUAL", 2ND BLOCK DOWN, IN MY LINK

http://www.jeep4x4center.com/knowledge-base/index.htm

......THIS IS THE BEST I CAN DO FOR YOU, RIGHT NOW

INSURE YOU PUT IN THE EXACT INFORMATION ABOUT YOUR VEHICLE--SHOULD YOUR YEAR NOT BE LISTED....JUST MOVE UP OR DOWN A YEAR

TESTING IS THE KEY AS TO AN EXPEDIENT AND INEXPENSIVE REPAIR

KEEP US INFORMED AS TO WHAT YOU DISCOVER OR IF YOU HAVE MORE QUESTIONS

AND YES,..........YOU DO OWE US LUNCH!....PICK US UP IN YOUR "REPAIRED" RIG.

THE MEDIC
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Tiny
CJ MEDEVAC
Aug 19, 2012.

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