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bad fuel pump?

bad fuel pump?

Postby brownbear [OP] » Feb 12 2011, 9:01pm

can anyone tell me if I have a bad fuel pump......the truck cranks, fuel is spraying out the injectors, and the fuel pressure gauge shows fuel pumping the needle to around 9psi. It ran started and ran ok a week ago. I just put a new iac valve in and a fuel pressure gauge to adjust the fuel pressure from my new fuel pressure regulator. why won't it start??????/
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Re: bad fuel pump?

Postby starspangled6.0 » Feb 12 2011, 11:24pm

What's the pressure supposed to be?
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Re: bad fuel pump?

Postby FairviewLT » Feb 12 2011, 11:27pm

Sounds like you've investigated the fuel side pretty thoroughly - do you have a spark? Something's gotta make that gas burn...
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Re: bad fuel pump?

Postby brownbear [OP] » Feb 12 2011, 11:40pm

best way for me to check for spark, and what if I don't? I have never checked for spark before......
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Re: bad fuel pump?

Postby starspangled6.0 » Feb 12 2011, 11:49pm

I know how to do it on small engine, but haven't done it ever on big V8 like yours. You can buy a spark tester; should be at your local auto parts stores.
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Re: bad fuel pump?

Postby starspangled6.0 » Feb 12 2011, 11:52pm

http://www.ehow.com/how_2060386_test-spark-plugs.html

Try this out. You should be able to test it just from cranking it over with the starter- just take it easy though, because you don't want to burn out your starter, too.
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Re: bad fuel pump?

Postby Portmanblaze91 » Feb 13 2011, 1:55am

Wow you've posted all over the place. Sounds like your in a panic.
FIrst, check your fuse block and make sure the ECM fuse is good. I think it's a 10amp. While your at it, check all your fuses.
Easiest way to test for spark is to remove a plug, put the plug back into the boot it came from and while holding the ruber boot, touch the the electrode (the bent end of the plug) against the manifold, or cylinder head, and hold it there. You wont get shocked. If your neverous about that, use a pair of insulated pliers to hold the boot. Have someone crank over the enigne and look for a blue spark.

Double check your wire going from the ignition coil to the center of the cap. You may of bumped it lose while messing with the fuel lines.

Good Luck!!
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Re: bad fuel pump?

Postby EKinMN » Feb 13 2011, 4:17am

OP started multiple threads. Please see the discussion continued here:
truck won't start
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