But why is it ok at part throttleDieing fuel pump, clogged fuel filter, internal tank hose falling apart (or pulsator leaking like hell), faulty regulator, bad signal line feeding regulator, clogged or curled up fuel sock, warped up stock vacuum block......
I figured I was going to have to start throwing parts at it to figure out what's wrong the funny thing is the car feels faster a part throttle then full throttleif the pump is tired, or the tank hose is hemorrhaging it might get you by at part throttle but when the pressure goes up, the leak (or weakness) might move your pressure into a severe lean condition.
There's no way to accurately troubleshoot over the interwebs until you can eliminate some items on that list then go from there.
Ill look for leaks but im suspecting the Fpr because i had to turn it quite a bit to get 2psi out of it and I've never had to do that with any other ones i adjustedYou don't have to start throwing parts at it, you just have to start inspecting and testing parts, then replace or fix what is bad.
If your base fuel pressure is 45 with the line off, you should be seeing that 50#s at part throttle 5#s of boost. Verify there are no vacuum leaks on the throttle body block, short hose on the block and the hard line on the FPR regulator. If the regulator line starts to leak at 5#s it can do exactly as you describe. For example.
If you just start tossing untested (even new) parts at it, you'll have a pile of untested parts, a light wallet, and might not even get it fixed before a head gasket shoots out the side of the block.
I'll check it now see what i come up withIt should be steady with the line off as long as you don't rev the engine. That line will pull the pressure down under vacuum and raise the pressure under boost. If that line has a piece of trash in it acting like a check valve or a hole that vents boost it will screw up your pressures (and your fueling)
So 42+15at full throttle is should be EXACTLY base pressure + lbs of boost.
Earl I know that but if the regulator is bad the pressure shoudnt drop if it still drops that means my pump is not flowing correctlycrimping the return line with show you deadhead pressure of the pump. I. E. the most amount of pressure it can generate (at idle voltage). It will also make your car go RICH as hell.
Earl I know that but if the regulator is bad the pressure shoudnt drop if it still drops that means my pump is not flowing correctly
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