Fuel Delivery issues, any suggestions?

[metr0p0lis1927]

So I check my fuel pressure at the pump and I'm showing a minimum 100 psi (actually beyond what my gauge will read ) but at the rail I'm showing about 10 psi dropping to 0 as I attempt to accelerate . I'm getting the same readings everywhere I check on top of the engine not just the check port, I've already replaced the damper and the fuel filter is also clear and I know I should be showing 36 or so psi at the rail, the regulators appear to be good and I know I have good vacuum on the damper and both regulators but this appears to explain why my car ( a MY 1984 ) appeared to be starving for fuel (turn out she was telling the truth but who knew ) any suggestions would be appreciated!

[Anthony10370]

sounds like a partially blocked line between the pump and the fuel rails. There should be no pressure differential in a closed hydraulic system without a restriction. In other words; the fuel pressure regulator should be the only restriction between the pump and the fuel tank return; if the pressure is supposed to be 36 PSI at the rail then it should also be approximately 36 psi at the pump (+ 1-3 PSI for the friction on the pipes due to the flow)

If the pressure at the pump is really that high then it'll burn the pump out if continued to run in this condition. Look for dents in the metal lines running under the floorboard, It is possible that a stone or branch or an extra large speed bump has dented the fuel feed tube. If there are no dents then it could be an old rubber fuel hose that has failed internally. I have seen it where the inside ply of the hose de-laminates and folds in on itself and causes a restriction.

Look for dents then start replacing the hoses, It's a 25 year old car now you don't want an old fuel hose spraying supercharged gas all over the place.

Hope this helps,
-Anthony.