Where is the fuel pressure regulator on a 1999 chevy silverado, the old body style.

Fuel pressure will have to reduced with a fuel pressure regulator but don't forget ignition timing advance and transmission shift points (if automatic) will be affected if you don't retain the TPS.

It's located on the fuel rail and has a vacuum line going to it.

check the feul pressure regulator disconent the vacuum hose while engine is running and see if there is any fuel comming from the port on the regulator if there is replace the regulator

You need to check fuel pressure with a fuel pressure gauge. The regulator is a good guess but the fuel pump can also be letting fuel pressure drop. Once fuel pressure drops on a hot engine the fuel in the fuel rail will boil and essentially be a vapor lock condition. Fuel pressure should be around 56 psi and hold steady for at least 45 minute to an hour. If it drops within a couple of minutes to check valve in the pump is probably bad and the fuel pump module will need to be replaced.

The other thing, when you replaced the fuel pressure regulotar is is possible that you did not get all the old pieces from the old regulator out of the fuel rail. It is common for the screen and o-ring from the old regulator to stay in the fuel rail and they need to be removed carefully with a small pick.


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Code p0300 is for mutiple missfires. Have you checked fuel pressure, fuel pressure regulator, plugs, wires, fuel filter... Those would be the main cause of Mutiple missfires.

It sounds like its possibly a bad fuel pressure regulator. Most parts stores will rent you a code reader, scan the computer for trouble codes. Come back here with any codes retrieved from the computer and we will help you figure this out. This could be a cheap fix, so I don't recommend randomly replacing things, that will get very expensive.

The fuel pressure regulator is located under the upper intake manifold or plenum. This large aluminum casting must be removed for access.I assume this is a 454 c.i.d.old body style pick up. 2000 was a split year for GM. Both old and new body styles.

Maybe your fuel pressure regulator valve!

check your pick up sensors

you could be having a bad pressure regulator ,it seems to be wasted now.