Hi All - I have a 1994 Fleetwood Southwind on a 1993 P30 chassis. Got back from 4th of July weekend and was pulling into storage the next day and just as I placed it in Park and set parking brake the engine died. After that it would not start and had 3/4 tank of gas. I used some starter fluid and it will start so it is a fuel delivery problem. Also I was not hearing the fuel pump. I am having a hard time locating the fuse / relay for the fuel pump. I have checked all fuses I can find any bad, all seem to be good. I have a Chevy service manual but it is terrible and has very little info. Does anybody have a wiring specs for a 1993/94 p30? I was having trouble with my gas gauge also so I dropped the tank and replaced the whole unit assuming it was a bad fuel pump but possible electrical. I need to start tracing the wires and checking them / possible bad ground or broken wire. The plug to the fuel pump has 3 prongs, I assume it is ground, power for the pump and sending unit signal. Does anybody know what the voltage should read for the 3 wires and which should have power when the ignition is on? Any help would be greatly appreciated cause I have a vacation planed Aug 1st and need to get this solved asap. Any suggestions on what else to check would be greatly appreciated.

If I recall correctly, the only wire that should have voltage is the fuel pump feed. The fuel pump ground is obviously a ground, and the sender measures resistance to ground so there's no voltage there either. Unfortunately I can't help you with a wiring diagram. Mine's a carb'd 454 with a mechanical pump.I didn't follow your post exactly. Are you saying you replaced the sender and pump and it still doesn't work? Or the trouble started after replacing the sender and pump?

Have you checked the fuel filter along the frame? Maybe try disconnecting the fuel line going into the fuel filter and see if the pump is pumping at all.

I'm not sure if they call it a relay but in the dog house mounted near the gas pedal there is a 3inch x 2inch black box that I changed on mine when I was having a hard start problem.

mike brez wrote:I'm not sure if they call it a relay but in the dog house mounted near the gas pedal there is a 3inch x 2inch black box that I changed on mine when I was having a hard start problem.Mounted on the plywood floor...under the fiberglass bubble thats the trans tunnel.....right next to your right foot. Fuel pump relay

When you are driving down the road power for your in-tank fuel pump is supplied through the oil pressure sending unit. That's at that the front left of the engine and down low of course.When you turn on the key, power is supplied back to the pump through a relay for 2 seconds. To check for that pump running you have to have somebody back there laying down under the tank as you turn the key on.When you turn the key to the start position the relay again provides power back to the fuel pump. As oil pressure comes up when the engine starts power is then picked up by the oil pressure sending unit.That relay is likely located under the dog house over by where your gas pedal is. It is held by a metal clamp.You may also have a multi wire connector at the top back of the tranny sort of down on the side a little through which that power goes back to the pump.Good luck.

1993 Chevy P30 fuel pump help | Good Sam Community

Tommy_U
Explorer
Jul 16, 2014
more to see - thanks for this information that will also help. Do you know what the voltage should be on these different plugs so I can check them?

Sully2 - thanks for the info
Tommy_U
Explorer
Jul 16, 2014
Fuel pump / sending unit was replaced as a whole. I can hear no pump while the key is turned on. I will open the line at the filter to verify but I believe the pump is getting no power. In the 3 plug wire is it the middle wire that supplies the power and do you know what volt is supposed to be supplied. My Dad has a 1992 p30 and you can hear the pump when the key is turned on as mine use to do. These seem to have pretty noisy fuel pumps which makes it pretty obvious when you can only hear silence. I will check for a box near the peddle in the dog house.
More_To_See
Explorer
Jul 16, 2014
When you are driving down the road power for your in-tank fuel pump is supplied through the oil pressure sending unit. That's at that the front left of the engine and down low of course.

When you turn on the key, power is supplied back to the pump through a relay for 2 seconds. To check for that pump running you have to have somebody back there laying down under the tank as you turn the key on.

When you turn the key to the start position the relay again provides power back to the fuel pump. As oil pressure comes up when the engine starts power is then picked up by the oil pressure sending unit.

That relay is likely located under the dog house over by where your gas pedal is. It is held by a metal clamp.

You may also have a multi wire connector at the top back of the tranny sort of down on the side a little through which that power goes back to the pump.

Good luck.
Sully2
Explorer
Jul 16, 2014
mike brez wrote:
I'm not sure if they call it a relay but in the dog house mounted near the gas pedal there is a 3inch x 2inch black box that I changed on mine when I was having a hard start problem.

Mounted on the plywood floor...under the fiberglass bubble thats the trans tunnel.....right next to your right foot. Fuel pump relay
mike_brez
Explorer
Jul 16, 2014
I'm not sure if they call it a relay but in the dog house mounted near the gas pedal there is a 3inch x 2inch black box that I changed on mine when I was having a hard start problem.
psa0298
Explorer
Jul 16, 2014
Have you checked the fuel filter along the frame? Maybe try disconnecting the fuel line going into the fuel filter and see if the pump is pumping at all.
turbojimmy
Explorer
Jul 16, 2014
If I recall correctly, the only wire that should have voltage is the fuel pump feed. The fuel pump ground is obviously a ground, and the sender measures resistance to ground so there's no voltage there either.

Unfortunately I can't help you with a wiring diagram. Mine's a carb'd 454 with a mechanical pump.

I didn't follow your post exactly. Are you saying you replaced the sender and pump and it still doesn't work? Or the trouble started after replacing the sender and pump?

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1993 Chevy P30 fuel pump help

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