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Unread 03-23-2009, 01:03 PM   #1
chaznad
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1997 TJ Wrangler 
 
Join Date: Mar 2005
Location: Sarasota , Fl
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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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Unread 03-23-2009, 01:26 PM   #2
Dans95ZJ
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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
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Unread 03-23-2009, 01:27 PM   #3
Dans95ZJ
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PS: Check your crank position sensor; might be going bad. //dan
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Unread 03-23-2009, 03:39 PM   #4
chaznad
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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
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Unread 03-23-2009, 03:54 PM   #5
Muratus
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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.
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Unread 03-23-2009, 05:05 PM   #6
kloppk
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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.
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Unread 03-23-2009, 06:31 PM   #7
chaznad
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Quote:
Originally Posted by Dans95ZJ View Post
PS: Check your crank position sensor; might be going bad. //dan
What and where is this ?
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Unread 03-23-2009, 07:39 PM   #8
kloppk
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Quote:
Originally Posted by chaznad View Post
What and where is this ?
Drivers side, top edge of the bell housing...

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Unread 03-24-2009, 11:39 AM   #9
Dans95ZJ
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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
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Unread 08-06-2009, 09:36 AM   #10
Aalbury
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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?
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