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Unread 09-08-2011, 11:48 AM   #1
bamasteeler
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1980 CJ7 
 
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Fuel pressure??

ON way to work today jeep started idling really rough and engine even shut down on me at stop lights a couple times. It acts like it's starving of fuel. Put an inline pressure gauge and when engine is running at idle it basically reads zero. What is fuel pressure of mechanical fuel pump? It seems to accelerate fine when reving the engine but stumbles hard when comes back to idle.

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AMC 258, T176, D300,
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1999 XJ CLASSIC
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Unread 09-08-2011, 03:19 PM   #2
h2ogun
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Mechanical pump output should be 4-8 PSI, normal around 6PSI.
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Unread 09-08-2011, 03:28 PM   #3
bamasteeler
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Thanks for info
Ended up I put the wrench to intake manifold bolts, wouldn't call them loose but did get a little turn out of them. Started up and idling fine now.
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AMC 258, T176, D300,
AMC 20 REAR, D30 FRONT

1999 XJ CLASSIC
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Unread 09-08-2011, 07:52 PM   #4
BagusJeep
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A vaccuum leak can indeed lean it out.

The pressure at idle is an interesting one, where and how you measure it is important as a properly configured Jeep system relieves some of the pressure before it reaches the carb inlet, therefore the gauge may read low at idle if plugged in at the carb end of the fuel line
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Unread 09-08-2011, 08:03 PM   #5
bamasteeler
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Quote:
Originally Posted by BagusJeep
A vaccuum leak can indeed lean it out.

The pressure at idle is an interesting one, where and how you measure it is important as a properly configured Jeep system relieves some of the pressure before it reaches the carb inlet, therefore the gauge may read low at idle if plugged in at the carb end of the fuel line
I was tapped in just before the inlet to fuel filter
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1999 XJ CLASSIC
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