Thread: P6T Chevy van fuel pump

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Does anyone have experience with a 1990 Chevrolet P6T van electric fuel pump?

This van has an electric pump in the tank and a mechanical pump on the block. The mechanical pump has a fuel return line which makes me think it's supposed to have both.

No voltage to the tank pump. The fuse block has a 10A fuse labeled tank f/p which is hot.

Also the sending unit doesn't work. I tried some contact cleaner on the wiper arm, no help. It shows open regardless of position.

Having trouble finding parts. I haven't put juice to the pump yet, I was going to replace it as a unit.

Comments and suggestions?

Y'all are going to join me in a Homer Simpson forehead slap - DOH! when I tell you what I figured out on the fuel pump: of course it isn't getting juice, the engine isn't running! The pump heavily resembles that from my 73 vega, and a vega sends voltage during crank and when oil pressure switch is made. So, I checked for voltage while cranking and yes! It's on a relay. So, I'm ordering a vega pump, as the old one is dead.

As for the sending unit, I carefully disassembled it and cleaned contacts with 100 grit sand paper, and it looks like it's going to work.

glad we could help ..

Just bouncing stuff off y'all is helpful, or at least therapudic.
It's a bit surprising, but the fuel pump is absolutely the same as a 74 Vega. Unfortunately, it didn't come with a sock, so more delay while I order one.

I'm only saving about $20 with having to buy the pump and screen. I'm beginning to wish I had just got the whole assembly.

That sounds like my kind of luck too. Haha

This one's fighting me.

Got the tank back in, but it still won't run.

I'll dig in deeper tomorrow.

But, the good news is that the fuel guage works, so does the oil gauge.

You posted that you ordered a VEGA pump-----------your vega was carb or FI? what is the van-carb or FI? if you are trying to run a FI engine on a carb pump pressure it won't work-------Try starting the engine by spraying starting fluid into intake--hell, I've done it with my mother in laws hair spray while down in the Ga mountains-----------

74 Vega has a low pressure in-tank fuel pump, feeding a Holley 2bbl.

This van has the same low pressure pump in the tank, feeding a mechanical pump with a return line.

The engine runs fine if i pour gas in the carb.

I should have bench tested the assembly before installing it in the tank.

The pump for a carb will not work for fuel injection------check your pressure------

OK, got back on it today. I broke loose the line at the carb, splashed some gas down the bore and cranked it. I got good strong spurts from the fuel line, so fuel is getting to carb fine.

I shut it down, tightened the line, and restarted while shining a light into the carb. Only the front left bore is getting fuel. It's almost enough to maintain idle. Looks like the carb needs rebuilt. No surprise there. It would have been a small miracle if it didn't, after sitting for years.

ok, now we know the engine has a carb-------is it a 2 barrel Holley?

It's a 427 with a 4bbl.

What brand/number carb?

It's a holley. Don't have it off yet, to get #s.

There is still a shop in Columbus that does carbs, I was going to let them build it.

There are sure a lot of vac lines on this thing.

Got a tip for how to keep track of them?