Crazy fuel Pressure

Good Morning All, I have a 88 t-bird with a problem. I retired recently and finally found time to work on my Tc. While I was still in the work force I purchased some well needed parts and stored them for after retirement. Anyhow the car has sat for a few years and now started the upgrades. I replaced the entire fuel system. New tank,pump,filter,regulator. Problem I am running across is fuel pressure, I have bunches. My new pump is a 255lph Walbro unit which puts out 150 lbs of pressure. I installed a Kirban adj.regulator but cant seems to get the pressure under 100 psi. In fact it layed fuel all over my floor out the header. So I put the new stock regulator back on and the same thing. I got these reading with the engine off and the key on and jumped the fuel pump to keep it on. Have I missed something? Also will the stock regulator the pressure being put on it?

Return line is pinched or plugged somewhere between the fuel rail and the tank.

Good call Jeff never thought of the fuel return. been playin with a carbed truck. So that would explain the adjustable regulator not responding to an adjustment. I will get on it in the morning. Thanks for the advice Jeff.

Well Jeff Korn was right, About a yr ago I pulled the gas tank and ordered a new one. While the tank was out I injured my back at work. Meantime the tank had come in and I had a rollback take it to a local shop to put the tank in for me. What happened is a Mud Dabber had made a nest in the return line. Removed the tank yesterday found the problem and now runs like a clock. Thanks to this message board for all the help

Glad I could help!

Well Jeff Korn was right

As if there was any doubt. :notworthy:

Thanks, Jeff, for all your help!

Your 1 smart cookie !!

Actually, if you understand exactly how the fuel supply system works, a plugged return line is the only possible cause of uncontrolled high fuel pressure. Not really rocket science.