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1998 Jeep Wrangler fuel pump issues

Tiny
71BEANS
  • MEMBER
  • 1998 JEEP WRANGLER
  • 6 CYL
  • 4WD
  • MANUAL
  • 150,000 MILES
I replaced the fuel pump/sending unit and now it won't start. Do I have to purge the air from the system? If so, how do I do that?
Sunday, April 25th, 2010 AT 5:35 AM

9 Replies

Tiny
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Hi there.

Petrol systems are self bleeding, do you have fuel rail pressure? Do you have injection pulse? Do you have spark?

Mark (mhpautos)
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Sunday, April 25th, 2010 AT 5:44 AM
Tiny
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The jeep ran just fine before I changed the pump. I was getting a code for bad fuel level, so I changed the entire unit.
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Sunday, April 25th, 2010 AT 6:26 AM
Tiny
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Check the fuel pressure at the rail, if no pressure you have an electrical problem, faulty new pump or the lines are back to front, can this happen? Are they the same size?

Mark (mhpautos)
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Sunday, April 25th, 2010 AT 6:29 AM
Tiny
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The pumps were the same. Is the fuel line directional? I don't remember taking it off, but may have and put it on backwards.
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Sunday, April 25th, 2010 AT 6:44 AM
Tiny
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Most pumps have 2 lines, pressure and return, some time with a 3 purge line (vapor) we really have to know if the pump is work, can you hear it hum when the ignition is turned on, do you have any fuel pressure?

Mark.
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Sunday, April 25th, 2010 AT 6:54 AM
Tiny
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I do not have a gauge to check pressure. Do I need one? The pump does hum when the ignition is turned on. There is only one line that comes out of the top of the pump and one eletrical connection.
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Sunday, April 25th, 2010 AT 7:12 AM
Tiny
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Take line off fuel filter and check for good flow, that should be enough for now, also check for spark and make sure that the plugs are not fouled up, have you run a scan as yet?

Mark (mhpautos)
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Sunday, April 25th, 2010 AT 7:22 AM
Tiny
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  • 5 POSTS
Fixed it. When I installed the "used" fuel pump/sending unit, I never noticed that the pick up tube was broken off inside the short extension tube that conntects to the pump motor. No wonder I was not getting any fuel. Thanks for all of your help today.
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Sunday, April 25th, 2010 AT 7:29 PM
Tiny
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OK, thats good, that was an easy oversight, but it shows the value of checking these things step by step, thank you for using 2carpros, you feedback is always welcome.

Mark (mhpautos)
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Monday, April 26th, 2010 AT 1:41 AM

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