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Fuel pressure regulator

Old 12-09-18, 09:21 AM
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Fuel pressure regulator

I just noticed that my stock fuel pressure regulator vacuum line was connected to a port on the upper intake manifold that was plugged up with JB weld. So without vacuum would that cause a rich or lean fuel condition? It would smell heavy of fuel and my afrís were all over the place the last few times I drove it.
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Old 12-09-18, 09:36 AM
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its supposed to be 40psi base fuel pressure + 0psi manifold pressure = 40 psi across the injectors.

since it didn't see a signal, it would do this

40psi fuel pressure + at idle -18psi manifold pressure = 22psi fuel pressure, but since yours wasn't working you would have 40psi and be rich

40psi fuel pressure + 15psi boost = 55 psi fuel pressure, but since yours only saw zero, you would have 40psi and be lean

when you are cruising, and manifold pressure is around zero, it would be correct, so it should run ok there
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Old 12-09-18, 11:06 AM
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Originally Posted by j9fd3s View Post
its supposed to be 40psi base fuel pressure + 0psi manifold pressure = 40 psi across the injectors.

since it didn't see a signal, it would do this

40psi fuel pressure + at idle -18psi manifold pressure = 22psi fuel pressure, but since yours wasn't working you would have 40psi and be rich

40psi fuel pressure + 15psi boost = 55 psi fuel pressure, but since yours only saw zero, you would have 40psi and be lean

when you are cruising, and manifold pressure is around zero, it would be correct, so it should run ok there
Do you think that would cause me to flood the last time I drove it? Also I was usually hitting 12psi boost and the last couple times I drove it I was only hitting 6-7 psi. My boost issue could be a ecu issue as I am also trying to figure out why T2 coil doesnít fire on start up. I thought it was a wiring issue but when messing around with the settings in my adaptronic ecu I was able to get spark on T2 when doing a spark test in diagnostic settings.
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