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Thread: Bad fuel pump symptoms ? Reply to Thread
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  Topic Review (Newest First)
05-11-2016 07:24 AM
NotURMailman You really should start your own thread rather than asking an unrelated question in a two year old thread...
05-10-2016 07:10 PM
ryan7676 hope yall dont mind but my jeep has me stumped. i just put a brand new 4.0 in my 97 wrangler. ive checked the timing rechecked and checked a dozen more times. it starts and idles fine but when you go to accelerate it stumbles and spits an sputters. ive replaced pulgs, wires, cap, rotor coil, all the sensors on the throttle body and checked all the injectors. would that be a weak fuel pump? any help would be awesome...
09-28-2014 01:50 PM
TRACY1 My jeep cheerokee lorenzo has a strong gas smell when tank is full. It also hesitates at 45-50 miles an hr likes it wants to choke up, any ideas on what it may be.
08-06-2009 09:36 AM
Aalbury hope you don't mind me jumping in with a fuel pump question. If i release the pressure in the fuel system, hook my gage up, and turn the ignition key on.. will the pressure only build if the fuel pump is working? Or will I need to disconnect the vaccum pressure to be sure?
03-24-2009 11:39 AM
Dans95ZJ
Quote:
Originally Posted by chaznad View Post
What am i listening for, after i turn it to the on position i hear a click after 4-5 seconds , thats it
Listen for the hum, the click is when it stops.
Probably wouldn't hurt to throw a pressure gauge on the fuel rail test port to see if you got pressure.

Also, if you disconnect the crank position sensor for 30 secs, then reconnect and start the engine. And if you want to be real precise, turn on until you hear that click and then turn the key to start. Should fire right up.
If it cranks and doesn't start, might be the pump.
Hope this helps.
Post what you find andwe'll all take it from there to get you going.

Dan
03-23-2009 07:39 PM
kloppk
Quote:
Originally Posted by chaznad View Post
What and where is this ?
Drivers side, top edge of the bell housing...

03-23-2009 06:31 PM
chaznad
Quote:
Originally Posted by Dans95ZJ View Post
PS: Check your crank position sensor; might be going bad. //dan
What and where is this ?
03-23-2009 05:05 PM
kloppk
Quote:
Originally Posted by Dans95ZJ View Post
Easy to check fuel pump. Just turn the key to ON and listen. The fuel pump will go on for about 5 secs and then stop as it reaches the right pressure.
Not quite... It shuts off based on "x" seconds passing and not due to a certain pressure being attained.
03-23-2009 03:54 PM
Muratus Are you having any issues when driving? Like lack of power, cutting out, backfiring, etc?

My fuel pump is out right now. I knew it was comming mostly cause when I got ready to start the Jeep I'd have to turn the key and give it a few seconds then crank the engine. Otherwise it would just turn over for 10 to 15 seconds before starting. It was having trouble building up presure. So when all the issues durning driving started up, I already knew what was going wrong.
03-23-2009 03:39 PM
chaznad
Quote:
Originally Posted by Dans95ZJ View Post
Easy to check fuel pump. Just turn the key to ON and listen. The fuel pump will go on for about 5 secs and then stop as it reaches the right pressure.


Dan
What am i listening for, after i turn it to the on position i hear a click after 4-5 seconds , thats it
03-23-2009 01:27 PM
Dans95ZJ PS: Check your crank position sensor; might be going bad. //dan
03-23-2009 01:26 PM
Dans95ZJ Easy to check fuel pump. Just turn the key to ON and listen. The fuel pump will go on for about 5 secs and then stop as it reaches the right pressure.

If you want to check the actual pressure, you'll need to buy the gauge, but it's cheap. The fuel rail has a test port that the gauge plugs into. Set it up and measure. Compare to specs: should be 44-54 psi

If you have to replace the fuel pump, it's in the gas tank. I did this on my ZJ without any problem, just getting some gas spills (and always on my face).

Dan
03-23-2009 01:03 PM
chaznad
Bad fuel pump symptoms ?

140,000 miles , how do i know its going bad .
Everything on my jeep is new front to back except this part. New optima battery, starter ,alternator plugs wires , all that.
when i start her up when cold it turns but will take 5 seconds or so, sometimes ill have to resort to a 2nd try but when warm shell fire right up....sound like the fuel pump to you?
Whats the cost of replacing one of these things?

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