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danny
danny, Mechanic
Category: Car
Satisfied Customers: 5064
Experience:  Mechanic at school corp bus garage! Experience in fleet diesel and regular automotive.
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1999 suburban: 5.7L..engine turns over but wont start...fuel pump 15k

Customer Question

I have a 1999 suburban K-1500 5.7L w/125K. The engine turns over but won't start. I replaced the fuel pump 15K ago and has been running well since. Parked the truck overnight and would not start in the morning. I have spark and I poured some fuel down the Throttle body and the engine fired right up so it's not getting fuel. I checked the fuel pressure with key on engine off and it is at 23psi. also at 23psi while cranking. I don't know how to check for a failed pressure regulator. ALso, will the SFI work with that low of pressure? Not sure what to do next.
Submitted: 6 years ago.
Category: Car
Expert:  danny replied 6 years ago.
Chat Conversation Started
danny :

hello

danny :

have you checked your fuel pump relay?

Customer :

I have not checked that. How do I check it? Could I use one of the other relays in the truck?

danny :

sure as long as its the same type

Customer :

Would that cause the fuel pump to indicate the lower pressure?

danny :

you should be gettin 55 to 65 psi

danny :

here is testing click here

danny :

fuel pressure reg could be bad

Customer :

Understand that the pressure should be 55-65psi. I will look at your link.

danny :

if it leaks off or doesnt hold then its bad no more than 4 psi in a 10 minutes

Customer :

OK, I will check that tomorrow as well. I have to rent the pressure testor. I want to make sure that I have explored all avenues before I pull th intake to get at the FPR.

Expert:  danny replied 6 years ago.
thats fine just make sure you cant just buy a couple of clamps and fuel hose and a cheap fuel gauge.

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