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Old 01-17-2013, 06:31 AM
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Fuel Pressure Question.

She's a '95 OBS PSD.
Is there supposed to be fuel pressure when the motor is not running?
As soon as she quits cranking over or I shut her off. the pressure drops to zero. I would think the pressure would stay.
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Old 01-17-2013, 01:32 PM
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electric gauge or manual? the pressure slowly bleeds off, but if it is an electric gauge and you cut power the needle will drop.
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Old 01-17-2013, 03:11 PM
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I am using a oil filled gauge set up to hook to a schroeder valve. The oil filled is a little slower than anything else, but the pressure drop is instant.

With the gauge in place, there is no pressure. Start to crank the engine and it will climb to 50 - 60 PSI. Holds steady pressure while running. About the same pressure.
As soon as the engine stops, the pressure drops off. Immediately.

I didn't think this would be right, but not sure. This could be the cause of alot of my problems if this is not right.
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Old 01-19-2013, 10:12 PM
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Cool

I think what he is asking you is if the gauge is run from a electric sender or a hose hooked to the fuel filter. If it is inside the cab it better be sender controled. And yes, the pressure does bleed of in a short time.
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Old 01-20-2013, 03:55 AM
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Quote:
Originally Posted by Ramsmoker View Post
I think what he is asking you is if the gauge is run from a electric sender or a hose hooked to the fuel filter. If it is inside the cab it better be sender controled. And yes, the pressure does bleed of in a short time.
It is a oil filled pressure gauge that gets threaded onto the shroeder valve on the filter housing. Nothing electric or any senders. All manual.
My bleed off is instant and that just doesn't seem right. There really isn't any bleed off to say, more like a drop off of pressure.
Of course I could be wrong, but instant doesn't seem right.
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