Fuel pressure lines

[Elementality158]

Dont feel like typing much so im gonna go half assed. Car takes forever to start in the cold. I replaced the coolant temp sensor. Im not sure if the wires are still good in the car, they look old and im not sure if its getting a good connection. But when i turn over the car. The fuel pressure regulator gauge jumps up and down from 0 to 30 and when i let off on the key it drops back down to 0. Im pretty sure that it should stay pressurized after i let off on the key. Any one have any answers to my questions?
Thanks

[x-pride]

My guage hangs there a little but than goes back to zero once the key is out of the ignition. How is your charging system?

[niterydr]

Dont feel like typing much so im gonna go half assed. Car takes forever to start in the cold. I replaced the coolant temp sensor. Im not sure if the wires are still good in the car, they look old and im not sure if its getting a good connection. But when i turn over the car. The fuel pressure regulator gauge jumps up and down from 0 to 30 and when i let off on the key it drops back down to 0. Im pretty sure that it should stay pressurized after i let off on the key. Any one have any answers to my questions?
Thanks

I don't feel like typing much, so I'll give a half assed answer.

It sounds like you have a fuel pressure issue.

Honestly, I would check your fuel pump, mpi relay, and if it isn't a fuel related issue, the ignition transistor can cause a slow start issue.

[Elementality158]

Charging system? Not sure what you mean by that.

[Elementality158]

Fuel pump is brand new. i think it might be one of the lines running from the top of the pump assembly. Or i was thinking fuel filter might be bad. Not sure though. Ill take a look at the MPI relay and the ignition transistor. I might just go pick up a new relay.

[Pushit2.0]

Did this happen after the pump install? It sounds like a fuel pressure issue, bad pump/wiring, bad o-ring from pump to fuel sending unit, fuel leak, bad regulator. How about the FP gauge it self, is that broken?

[niterydr]

Fuel filter would not cause that issue, it would be a consistant lack of fuel pressure.
O-ring is a good possibility as well, good call John.

[Elementality158]

It happened after i did an engine swap. Maybe the O rings on the injectors? Wouldnt i see fuel shooting from one? Maybe i should switch to a stock fpr.

[Goat Blower]

Is the fuel pressure gauge electric or one just screwed into the FPR?

[Elementality158]

screwed into the fpr. maybe i should take it off and put new teflon tape on it? or just not go by that?