My car is ready to start, but when I put the car on "ON". The fuel pump runs, but the fuel pressure is bouncing up and down, is there something wrong with the pump?

It is a carter 8 psi pump.

 

Is this the first time that you've used this pump or is this problem just randomly occurring for the first time? If you just installed the pump, then my recommendation would be to do the wiring upgrade in the archives if you haven't.

 

Yeah, it's his first time installing the pump. The pump was used but in great condition... it did sat for awhile before the install. Maybe a year or two? Would that matter?

 

The pressure was above 7 psi bouncing up to 10 psi... just for reference.

 

It is bouncing from 5.5 to 9 now.

 

Is that with the key on, but the motor not running?

 

i have a simluar problem just lost pressure completly the other day was just going to pull the fuel system apart as i thought it was a blockage!, very random though, i also have not rewired the pump (facet red top) but it has been running fine for over a year
Mark

 

Yes.

I think it is because i filled the float bowl with too much gas and causing back pressure to the pump, I don't have a fuel return setup. I started the car for a little bit and the pump works fine.

 

Does sound the the pump is phasing in and out of bypass mode. What regulator are you using and what's the pressure set at? Even with the pump phasing, the regulator should show steady output pressure at what the regulator is set at.

 

check out the crap that came out of my old fuel filter! its been out the car a coouple of weeks so dried out but it was like sand!