fuel pressure? - Chevy and GMC Duramax Diesel Forum
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Old 06-29-2009, 05:53 PM   eBay Motors  #1 (permalink)
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fuel pressure?

what is the fuel pressure suppose to be stock? say at idle an WOT? thanks.
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Old 06-29-2009, 06:21 PM   eBay Motors  #2 (permalink)
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well if u dont have a lift pump it wont be pressure it will be a vacaum reading
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Old 06-29-2009, 06:35 PM   eBay Motors  #3 (permalink)
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a friend is wanting to get a fuel pressure gauge....an he asked me what it should be reading an i said i have no idea.....so is a fuel pressure gauge no nessary with out an aftermarket lift pump?
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Old 06-29-2009, 06:39 PM   eBay Motors  #4 (permalink)
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WOT a lb7 lly will be 23,300psi

WOT a lbz lmm will be 26,600psi

At idle they are all around 5k i believe.

That is rail pressure, you wont get any fuel line pressure with out a lift pump.

A lift pump is good around 10-12psi at idle. Anymore than 14-16psi and it will cause the motor to lope=no good. At WOT you want atleast 4-6psi IMO or atleast a positive number.

With a heavy fueled 500hp tune you can drain the rails down to 10,000psi and the motor will spit and sputter. A lift pump will help maintain 21,000-26,000psi depending on your tune.

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Old 06-29-2009, 07:03 PM   eBay Motors  #5 (permalink)
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a friend is wanting to get a fuel pressure gauge....an he asked me what it should be reading an i said i have no idea.....so is a fuel pressure gauge no nessary with out an aftermarket lift pump?
you got it no need for a gauge without a lift pump. unless he is wanting to know his rail pressure but there is really no need for that if he is stock
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Old 06-29-2009, 07:13 PM   eBay Motors  #6 (permalink)
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Originally Posted by nwtdiesel View Post
WOT a lb7 lly will be 23,300psi

WOT a lbz lmm will be 26,600psi

At idle they are all around 5k i believe.

That is rail pressure, you wont get any fuel line pressure with out a lift pump.

A lift pump is good around 10-12psi at idle. Anymore than 14-16psi and it will cause the motor to lope=no good. At WOT you want atleast 4-6psi IMO or atleast a positive number.

With a heavy fueled 500hp tune you can drain the rails down to 10,000psi and the motor will spit and sputter. A lift pump will help maintain 21,000-26,000psi depending on your tune.
sweet thanks.....
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Old 06-29-2009, 07:13 PM   eBay Motors  #7 (permalink)
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you got it no need for a gauge without a lift pump. unless he is wanting to know his rail pressure but there is really no need for that if he is stock
makes since.....he is just wanting to fill his gauge pod so that is why he is wanting a fuel pressure/rail pressure gauge


thanks
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Old 06-29-2009, 07:18 PM   eBay Motors  #8 (permalink)
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high pressure diesel in the cab, humm id pick a diff temp gauge first
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Old 06-29-2009, 07:26 PM   eBay Motors  #9 (permalink)
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high pressure diesel in the cab, humm id pick a diff temp gauge first
You can get 15psi to 100psi electrical fuel press gauge from autometer.....

That would be perfect for his lift pump application.
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Old 06-29-2009, 07:28 PM   eBay Motors  #10 (permalink)
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Quote:
Originally Posted by nwtdiesel View Post
You can get 15psi to 100psi electrical fuel press gauge from autometer.....

That would be perfect for his lift pump application.
no i mean rail pressure . lift pressure sure
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