my 93 camaro lt1 wont start when i crank it... if i spray starter fuild it will until it runs out... i was told that even though i was seeing fuel at the check valve on the fuel rails under the hood that if there was not enough pressure the computer would not open the valves and the car would not start...
is this true? and if so what should the pressure be at? how do i check it? if bad pressure what do i do to fix?
thanks
camaro z28 rocks.

 

no one has any ideas?

 

You need a fuel pressure gauge, hook it up to the schraeder valve on the fuel rail. Get a reading and get back to us.

You can also pull the vacuume line off the fuel pressure regulator. If you smell or see fuel it is bad.

 

You should hear the fuel pump run for 2 sec when you key on. Do you?

There is also a fuel pump prime lead near the PCM you can use to test the pump, Shoebox has instructions.

 

If the pressure is too low, the injectors will still "open"..... they just won't spray enough fuel. To achieve the injector's rated flow capacity - the value that is programmed in the ECM - you need a 43.5psi difference between the fuel rail pressure and the intake manifold pressure (vacuum).

At idle, with the vacuum compensation line off the fuel pressure regulator, you should see 41-47psi. When you attach the vacuum line, fuel pressure will drop proportional to intake manifold vacuum. An 8psi drop on a stock cam wouldn't be unusual. At WOT/max RPM you want the fuel pressure to hold at least 40psi. When you shut the engine off, the fuel pressure should continue to hold, with a very gradual pressure bleed off. If it drops to "0" on engine shutdown, you're going to have a hard start situation.

 

fuel pressure gauge directs the driver if the amount of pressure the injected fuel is carrying, allowing to get around the usual problem of air-to-fuel ratio inconsistency. for an optimized fuel burn, you can tweak on the air intake to complement the fuel. my dad had gone his chevrolet camaro fuel pressure gauge installation on his '96 beretta Z26...just same situation when the car idles before a stop.

 

The quotes on the "Pit Stop" site are virtually incomprehensible. They make no sense whatsoever. If I was buying parts, I'd avoid them at all costs.......