arad99

iTrader: (2)

When I first checked it, the fuel pressure was 25psi in line. Then I wanted to get the max pressure from the pump. That was the 22psi, dead headed.
So, I decided to check the voltage at the pump, which showed 5 volts across the black and red wires. Now I get 0.0 volts across the red and black wires. The jumper is on the yellow connector.
I'm not sure why I was getting 5 volts before and 0.0 volts now. Something changed.

RotaryEvolution

iTrader: (30)

red and black are not the correct wires.

black is ground at the top of the tank
black/white is 12v pump power

red is signal to either the low fuel light or the fuel gauge, i forget which is which.


i have also seen people wire up pumps to the red wire on the bulkhead, but the pump probably wouldn't even run wired that way.

arad99

iTrader: (2)

Thanks Ben. I didn't look them up, I just assumed red & black.

arad99

iTrader: (2)

I finally found the problem. I had checked the fuel pressure several times and the pressure was always around 31 psi with very little drop off after 5 minutes. But, I always checked it after the engine had cooled off a little. Last night I checked the fuel pressure right after it had been running really bad. The fuel pressure only showed 25 psi and it started dropping quickly.
The problem was the fuel line going from the primary injectors to the secondary is soft right at the top fitting and when the engine gets really warm the fuel line expands and allows gas to spray out dropping the fuel pressure and starving the secondary injectors.
I haven't actually put the engine back together and tried it out but it seems to make sense. Should be ready for a test drive tomorrow.

Logitikes

just curious, but couldnt you smell that?i mean thats quite a bit of fuel being sprayed out for someone not to atleast catch a wiff of that... anyways good luck!

arad99

iTrader: (2)

Yeah, you would sure think so....... right? I did see it spray but evidently that is not the problem.