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Old 12-13-2011, 03:16 PM   #1
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fuel pump pressure

hom much pressure should my fuel pump put out
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Old 12-13-2011, 07:05 PM   #2
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Re: fuel pump pressure

year/make/model etc usually helps get responses....
Old 12-13-2011, 07:44 PM   #3
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Re: fuel pump pressure

A TBI should be 12-13 psi, all others are 50 @ idle, and 60 @ WOT
Old 12-13-2011, 10:44 PM   #4
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Re: fuel pump pressure

its a 2000 s10 2.2l
Old 12-13-2011, 10:52 PM   #5
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Re: fuel pump pressure

Quote: Originally Posted by firsts10
its a 2000 s10 2.2l
41-47 psi
Old 12-13-2011, 11:01 PM   #6
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Re: fuel pump pressure

if there is presure in the fuel line and spark what would be the other reason it wouldnt start. it just turns over
Old 12-14-2011, 12:53 AM   #7
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Re: fuel pump pressure

just because there is pressure, doesn't mean it's enough. you'll need to rent a tester.

does it start with a shot of carb cleaner?
Old 12-14-2011, 02:10 AM   #8
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Re: fuel pump pressure

Did you actually check the pressure with a gauge, what is it?

If you are checking at the shrader valve, and it correct, for now it should be enough to get it started. After it's running and you still have problems then you would need to confirm sufficient flow, filter/pump.

Spark can be present, but like fuel delivery, it must be sufficient to do the job. A weak spark, or a good one at the wrong time will do you no good.

You need a good snapping blue spark. Less than that and you need to dig deeper. Is the spark going to the right cylinder at the right time? If the cap is carbon tracked or damp the spark goes to the wrong cylinders. If it's damp or cold where you are I'd pull the cap off and look around. Dry it out with a tissue. I've even seen plug wires so bad that it won't start when damp out. Crank it and look at the plug wires in the dark to see if they are leaking voltage.

You also need compression. Any problems with starting before this? Or did this just come out of the blue? A compression loss usually comes slowly so it would be getting harder starting over time.

If you have confirmed that you at least have fuel pressure while cranking it, put a timing light on #1 and crank it. See if it flashes when near the TDC mark.

If you have a good spark, give it a squirt of gas in the intake to see if it responds. You may have spark, fuel pressure, but the injectors may not be operating.
Old 12-14-2011, 01:21 PM   #9
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Re: fuel pump pressure

it never had problems starting just one day when i came back from the store it didnt want to start but thanks for the tips im going to check the plugs and wires next. it wont even start with starting fluid
Old 12-14-2011, 01:50 PM   #10
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Re: fuel pump pressure

If new plugs and wires don't solve your issue. And it truly is an ignition relater problem. Start here.... http://easyautodiagnostics.com/gm_22...agnostic_1.php
Old 12-15-2011, 02:43 AM   #11
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Re: fuel pump pressure

Quote: Originally Posted by Murkshev
If new plugs and wires don't solve your issue. And it truly is an ignition relater problem. Start here.... http://easyautodiagnostics.com/gm_22...agnostic_1.php
Nice link.. Lots of good info on the 2.2
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