No Fuel Pump ??

[olds70supreme]

Hello,

Finally got a chacne to get back into the garage and work on the 95% complete engine/trans swap. I made new fuel line and wanted to make sure I flushed it, so I jumpered out the neutral safety and oil pressure switches. When the key is turned one click the idiot lights come on (as they should) but the pump does not run.

I pulled out my chassis service manual and it shows a 20 amp fuse for the fuel pump. However, my fuse panel has a 10 amp fuse in that position, labeled elec fuel pump. The fuse was blown, so I replaced it with a new one. Still no fuel pump.

Questions:

Other than the two switches above, what else should I look for that enable the fuel pump?

Is the elec fuel pump fuse supposed to be a 10 amp or a 20 amp fuse?

[48 Fiat]

Ya might check to make sure you have a good ground to the fuel pump / sending unit. Does the fuel gauge read properly? Just a suggestion! Good luck, Dave

[spencerforhire]

The oil pressure switch has 3 wires; pink(ignition), purple(start) and blue(fuel pump).
When there's no oil pressure, the pump is connected to start, and when the engine is running, the pump is connected to ignition. If you jumper the pink and blue the pump should run when the key is on. Or you could try jumping 12v directly to the terminal for the fuel pump fuse in the box to test without the key on, but the fuse has to be removed or the starter will try to engage.

[olds70supreme]

Okay, I've got 12 volts at the fuse. I traced the wiring back into the hatch area and found the wiring connector w/ the sending unit and fuel pump wires. The fuel pump wire doesn't show any voltage at that point. So, the problem obviously is between the fuse box and the pigtail connector. Do the wires run internally in the car, such as under the carpet? Is it possible that the fuse box is bad at a point after the fuse itself?

Thanks.

[spencerforhire]

Look in the area between the kick panel and the fuse box for a long 10 pin connector; it has plugged into it a flat harness for the rear body & tail lights that has 6 wires. The fuel pump feed wire is pink on the 10 pin side and dk. blue on the 6 pin side. The harness does indeed run under the carpet and could be broken anywhere along the way.

[80 MONZTA]

Not sure what car you are working on, guessing it is the 75 Starfife under your user name. On my 80 Monza, the fuel pump and taillight wiring is inside a black plastic tube all the way from front to back. It starts close to the steering column, then is behind the drivers side kick panel, under the aluminum sill plate, behind the large plastic side panel up and over the wheel housing to where it has a connector in the drivers side rear corner. I think it would take a LOT to damage that wire anywhere along the way.
Your questioning if the fuse box could be bad got me to remember that I had problems with my fuse block. One day suddenly the turn signals did not work (very long story short) there was a problem where the glass fuse is held in place. Wiggling the fuse a bit would allow the signals to work for a while, sometimes for months. I never did look into a permanent fix for it.

[olds70supreme]

Look in the area between the kick panel and the fuse box for a long 10 pin connector; it has plugged into it a flat harness for the rear body & tail lights that has 6 wires. The fuel pump feed wire is pink on the 10 pin side and dk. blue on the 6 pin sidea

Damn, I wish I would have checked here again before I went out to the garage . I ended up finding the problem, it was by the 10 pin connector, about 1.5" out on the blue wire. The solid blue wire was broken there. I am no good at soldering, what is my best bet for a repair here? Butt crimp connector w/ heat shrink?

Thanks.

[spencerforhire]

Solder would be the preferred way, especially since the pump in on ALL the time the car is running. If you insist on crimping it, make sure it's real snug. I suggest the more expensive type of butt connectors that have the shrink already on them, or even better there are ones available with solder in them as well. Be prepared to pay $5-$10 for a package of 3 or 4 them at the auto parts store.