My F250 Will not start

[Randall O]

I have a problem with my 1993 F250, 5.8. I have changed the fuel filter and the Air Idler Control Valve and it still will not start until I spray starting fluid in the throttle body. When it starts it idles at a very high rpm until I unplug the air idler control valve then it runs good. can anyone help?

[taillight]

Check your fuel pressure running and off.

[Randall O]

How do I check it?

[Torch]

On or near your fuel injector fuel rail there is usually a screw on valve (looks similar to a tire valve (sort of)) where you can attach a fuel pressure gauge to.

Get a manual for your truck, it should show you where this is and what the pressure should be.

The pressure is usually pretty high, don't poke the valve with a screw driver it will spray gas everywhere.

[Randall O]

Originally Posted by Torch

On or near your fuel injector fuel rail there is usually a screw on valve (looks similar to a tire valve (sort of)) where you can attach a fuel pressure gauge to.

Get a manual for your truck, it should show you where this is and what the pressure should be.

The pressure is usually pretty high, don't poke the valve with a screw driver it will spray gas everywhere.

Thanks I will try that today. What is wrong if I have Low pressure? Is The fuel pump going bad?

[taillight]

Either the pump is bad or the pressure regulator.

[Torch]

(As was said in the previous post) either the pump is going bad, the regulator is going bad, or your fuel filter is clogged. One other possibility is that you have one or more fuel injectors that have gone bad and are leaking fuel pressure right into the cylinders but I highly doubt that is the problem.