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Unread 08-27-2014, 10:38 PM   #1
Moabjeep77
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1990 YJ Wrangler 
 
Join Date: Feb 2013
Location: Magna, Utah
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911 Help! fuel pumps keep going out

1990 jeep yj 2.5L TBI
For some reason my fuel pumps keep going out....
I think my wiring might be bad that goes to the pump where the two connectors meet.
My question is can I cut the old connectors out and splice in a new weather pack connector? also where is the pump grounded to? im lost I cant figure this out.

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Unread 08-27-2014, 10:46 PM   #2
mike134
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1989 YJ Wrangler 
 
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How do you know the fuel pumps are going out instead of the fuel pressure regulator malfunctioning? What are the symptoms? blowing fuses or don't hear the fuel pump turn on with the ignition key? something else?
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Unread 08-27-2014, 10:50 PM   #3
Moabjeep77
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where the pump wires connect to the wires that run along the frame or whatever there is electrical tape holding it together, there is a weird humming, whining noise coming from the tank. fuses are fine, I can hear the pump turn on when the ignition is turned on. Wheer is the fuel pressure regulator?
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Unread 08-27-2014, 10:59 PM   #4
mike134
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haha electrical tape is never a good sign. I'm not sure about the humming sound, the pump should make some noise though.

If you can get to autozone, borrow their fuel pressure gauge. It's free to borrow but you have to leave a deposit. It just plugs into the shrader valve on your fuel rail. This will at least let you know if the pump is bringing you up to the proper pressure. Should be 31-32 psi at idle.

Does the jeep run rough/sputter or not start at all? Also, I assume you replaced the fuel filter with the new pump?
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Unread 08-27-2014, 11:04 PM   #5
Moabjeep77
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runs rough, starts just fine, but when driving it it sputters and barley wants to go....this is like the third fuel pump to go out.
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Unread 08-27-2014, 11:11 PM   #6
mike134
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ah yeah. get the pressure gauge from autozone so you can run a couple more tests, should take about 10 minutes.

With the pressure gauge plugged in turn the ignition to on but don't start the jeep. Let us know what the pressure is. Then start the jeep and let it idle, let us know what this pressure is. Next pull the vacuum line off from the fuel pressure regulator, let us know what the pressure is. Reconnect the vacuum line, let us know the pressure. Then turn the jeep off and wait for 30 minutes, let us know what this pressure is. Next turn the jeep back on and get the pressure at high rpms.

This will help diagnose the problem.
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Unread 08-27-2014, 11:15 PM   #7
Moabjeep77
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funny thing is when the new pumps were put in the jeep would run fine for a few months then all of a sudden they go bad??? where is the fuel pressure regulator?
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Unread 08-27-2014, 11:32 PM   #8
mike134
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Hopefully this is in the same place for the 2.5L. The fuel rail is shown in the diagram. It is on the left side of the valve cover and runs parallel to the valve cover.

You'll disconnect that vacuum hose that is labeled for part of the test.
fpr.jpg

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Unread 08-28-2014, 09:21 AM   #9
Fozzybear42
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Quote:
Originally Posted by mike134 View Post
Also, I assume you replaced the fuel filter with the new pump?
^^ Important question that hasn't been answered.

Also, while you're hitting the parts store for the pressure gauge, grab a Chiltons or Haynes manual. They're invaluable.
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Unread 08-28-2014, 09:56 AM   #10
Moabjeep77
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Yes fuel filter is new. I also have manual to.
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Unread 08-28-2014, 10:09 AM   #11
mike134
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Official Shop Manual >> Chilton's Manual >> Haynes Manual

(that's "much much greater than", not an arrow pointing to the better one...). Buy the official manual if you can. Its like a million pages long.
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Unread 08-28-2014, 10:21 AM   #12
Fozzybear42
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Quote:
Originally Posted by mike134 View Post
Official Shop Manual >> Chilton's Manual >> Haynes Manual

(that's "much much greater than", not an arrow pointing to the better one...). Buy the official manual if you can.
Yeah for sure, I was just suggesting that to answer questions like "Where is the pressure regulator?" without having to wait for a forum response.
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Unread 08-28-2014, 11:45 AM   #13
Que89YJ
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1989 YJ Wrangler 
 
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The pressure regulator is built into the throttle body. The regulator cant cause a pump to fail. Bad wiring is the likely issue. For the info on the TB:
http://www.jeepforum.com/forum/f12/8...ocess-1293442/


I thought this might interest you:
http://www.jeepforum.com/forum/f12/m...-swap-1088945/
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Unread 08-28-2014, 12:05 PM   #14
mike134
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It may really be an electrical issue causing the pumps to fail, but I wouldn't keep putting pumps in until checking the fuel pressure. If there is good pressure, then something else is causing rough running. There are a lot of possible causes for those symptoms.
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Unread 08-28-2014, 12:54 PM   #15
Mike Romain
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First off I would find out what is under the tape and verify that plug is good or change it out like you mentioned. The pump ground is on the parking brake frame. Low power can make a brand new pump turn, but get a little wear on the brushes and you can have issues. It can also arc brushes causing failure.
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