Quote:
Originally Posted by 6=8
How low can you go? When you are adjusting the FPR with the line off, can you dial it down to say, 20 PSI? (Only as a test!)
If the return line is restricted, the FPR will not be able to lower the Fuel Pressure... Especially with a high-volume fuel pump! Either that, or the FPR is bad.
I forget what the Idle fuel pressure should be with the line on... Knowing this might help diagnose the problem... Maybe someone that knows will post what the FP should be with the line on!
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It really depends. There is no set amount because the line on pressure is dictated by the vacuum your engine is able to pull at idle.
As an example suppose you have an average engine and at idle it's pulling about 15InHg of vacuum. That would be aprox 7.5psi down from your desired line off pressure. If you want a line off pressure of 43, then you'd shoot for a line on pressure of 35-36.
Hope that helps.
But you need to know what your vacuum at idle is to set it this way (not a reliable method).
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