again im having some BS fuel problem i hooked up a pressure tester started the car and it went up to about 47 psi but the mechanic that let me use the tester said it should hold the pressure for about 5 min and as soon as i turn the car off and make my way around the door the gauge is at 0 also i pulled the vac line off the regulator no gas came out but if the car is running it stalls the engine the mechanic also said thats wierd it should just make it run choppy for a min im trying to rule out the pump (way to expensive and i dont think the trap door is going to work on the conv witch means the entire rear end would have to come out) not something im looking forward to

 

If the pressure drops as you said, then this is posible:
1) Fuel pump check valve is bad (replace pump)
2) Regulator is bad. Regulator can go bad without having gasoline in the vacuum line
3) One or more injectors are leaky or hanging open. Check for grounded control leads before pulling injectors.
4) There is an external fuel leak. Get fire extingishe ready

 

you can set up a valve on the return line or,,, do what i did, i clamped off the return line on mine to confirm the fuel pressure regulater was the problem. i slid the cover up and found some fuel line that was not so stiff from uv rays then put some cardboard over the line folding it over so both sides were covered. i have some wide end vice grips that i used so it wasnt clamping on a small spot that would crack the plastic line. there not real wide but a little wider than the regular ones. if the pressure holds with the line clamped or shut off then its the fuel pressure regulator if not its the pump.

 

could a leak in my gas tank cause this its on the top of the tank

 

craby im not quite understanding whats the point of the cardboard and where would the return line be exactly im not to familiar with fuel systems yet

 

The fuel pump delivers fuel at the same rate, regardless of what the engine wants, and is much higher than what the engine wants. The pressure regulator maintains proper pressure at the fuel rail by returning excessive fuel back to the fuel tank via the return fuel line. The regulator adjusts the pressure according to engine vacuum. High vacuum means low engine load and the regulator drops the pressure by a few PSI; low vacuum indicates the engine is under load and the regulator increases the fuel pressure. The vacuum line to the regulator provides the vacuum signal. A quick check for the regulator is to first test the fuel pressure with the engine idling and the vacuum line disconnected, this will falsely tell the regulator that engine is under full load and the gage show the maximum fuel pressure available. The second test is done by re-connecting the vacuum line. The regulator now sees a high vacuum indicating low engine load and it will lower the fuel pressure by 5-10 PSI. If the pressure fails to change the regulator is bad.

 

yes if the fuel line is what is leaking.
dd

 

no its not a line i stupidly put a screw into it b4 i noticed thats where the tank is