test fuel pressure with vacuum pump?

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  #1  
Old 01-31-02, 09:15 AM
bledsoe
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test fuel pressure with vacuum pump?

Guys, I don't have a fuel pressure gauge, but I have a vacuum pump. Can I use that to test fuel pressure on a fuel injected engine? I've read that there's generally a schrader valve somewhere inline between the fuel rail and the tank itself, so can I hook it up somewhere in between there? Could you quickly walk me through the steps of doing this test with either the pump or fuel pressure gauge. Thanks. my vehicle is a '96 jeep cherokee, 4.0.
 
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  #2  
Old 01-31-02, 09:20 AM
Joe_F
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No way .

Go to Autozone and pick up one from their tool rental program. They don't charge as I recall.
 
  #3  
Old 01-31-02, 09:26 AM
bledsoe
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Ok, could you quickly walk me through the steps to perform the test? Thanks
 
  #4  
Old 01-31-02, 09:31 AM
Joe_F
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You should pick up a repair manual as each vehicle differs.

The kit should also have the testing instructions, so follow them to the T.

Why are you checking the fuel pressure?
 
  #5  
Old 01-31-02, 09:49 AM
bledsoe
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I actually don't need to check it, but was just wondering how "in general" to perform this test, just for the sake of knowing how to do it. I don't need specifics to my vehicle, just wondering how it's done. I'm guessing you would relieve the pressure in the system somehow(opening gas cap?), then turn on fuel pump(by turning key to "on" position), and watch the gauge wherever you hook it up.... Am I close? Do all vehicles have a valve that you can hook up a fuel pressure gauge to?

Again, I was just wondering in general. just keeping busy at work...
 
  #6  
Old 01-31-02, 09:51 AM
Joe_F
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You check cranking pressure, regulated pressure (running engine) and bleed down.

Most have the schrader valve. Not all do.

You want to look at the way the manfacturer wants you to test the pump, again they all vary in what they want . But yes, you are on the right track.
 
  #7  
Old 01-31-02, 09:58 AM
bledsoe
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Thanks. Since you mention it, my '96 cherokee with 90K miles does actually take a few seconds of cranking before it actually turns over. Because of this, I was actually thinking of checking the fuel pressure, but since it isn't a problem yet I guess I'll hold off for now. Thanks dude
 
  #8  
Old 01-31-02, 09:59 AM
Joe_F
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Those always had a bit of an extended crank from what I recall.

Sure, no problem.
 
  #9  
Old 01-31-02, 12:03 PM
bledsoe
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Joe, do you know if this vehicle's trouble codes can be retrieved with an OBDII scanner. If not, do you know how? '96 Cherokee
 
  #10  
Old 01-31-02, 12:53 PM
Joe_F
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Yes, on this vehicle you need an OBDII machine to retrieve your codes.

Again, Autozone for one place, rents them.
 
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