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Tractor Talk Discussion Forum

fuel pump question

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Dan-IA

05-04-2007 20:32:36




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I'm working on a 1986 Chevy Celebrity. I replaced the fuel pump about 1700 miles ago, but the other day I started getting hesitations and then it started stalling out. I suspect the fuel filter, as it was not replaced at the same time.

I have the fuel lines off the filter on the pump side, but while I'm at it I'd like to just hook the pump up to a spare car battery and drain whatever is in the bottom of the tank, to get out any water and old nasty gas.

Can I run the pump direct and let it run continuously without hurting it?

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Mike Van

05-05-2007 14:24:42




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 Re: fuel pump question in reply to Dan-IA, 05-04-2007 20:32:36  
I don't think any will pump the tank down empty, unless the pick-up is in a sump. Probably a 1/2" of gas is going to be left in the tank, so why bother? To really empty it, take it off and pour it out, that way you'll have it all. I had a JD tractor that would run fine, then just die. Restart, run a little & die. Dumping out the gas tank & starting clean was the fix. Some of it in a mason jar, you could see the globs of water in there.

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NEsota

05-05-2007 14:16:48




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 Re: fuel pump question in reply to Dan-IA, 05-04-2007 20:32:36  
It might be that the pick-up sock filter in the gas tank has issues/is partially plugged. Keep in mind that gasoline cools the fuel pump so if it runs too long empty it may over heat.



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Dan-IA

05-05-2007 15:42:35




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 Re: fuel pump question in reply to NEsota, 05-05-2007 14:16:48  
Yeah, overheating the pump was my biggest worry. That, and whether the pump is rated for continuous duty or for only intermittent duty.

Call me lazy, I just didn't want to damage the pump and have to take the tank back out if I didn't need to.



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Bob

05-05-2007 07:21:12




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 Re: fuel pump question in reply to Dan-IA, 05-04-2007 20:32:36  
The simple answer is YES. The pump runs continuously all the time the car is running, at full battery voltage, PLUS it's building pressure. So, simply pumping the tank out is easy on it.

There's a fuel pump test pigtail hanging out of the wiring harness, probably in the area between the left headlight and the transmission, IIRC,light red in color, (green is torque converter test wire). If you can find the wire and apply battery voltage to it, the pump will run.

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Dan-IA

05-05-2007 15:40:07




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 Re: fuel pump question in reply to Bob, 05-05-2007 07:21:12  
Fantastic advice!

After reading this I found the fuel pump test line, drained it almost clear dry, put a new fuel filter on, put fresh gas in it and she's running great now!

Thanks!



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circus

05-04-2007 21:06:11




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 Re: fuel pump question in reply to Dan-IA, 05-04-2007 20:32:36  
It's hard to figure what wouldn't make your car stumble and stall. Elimination of possible causes is the way to go. Cheapest first. Plugs, fuel pressure, EGR, codes, etc. PS Some engine models have a fuel pump jumper terminal by the battery.



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Blue3992 (N Illinois)

05-04-2007 20:55:51




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 Re: fuel pump question in reply to Dan-IA, 05-04-2007 20:32:36  
You probably could, but why bother?

Most gas contains ethanol, which absorbs water. So, there shouldn't be any water in there. If you're really concerned, run a bottle of HEET through there.

As far as old gas goes, if the car is currently driven regularly, there shouldn't be any "old gas" in there. It all mixes together.

Not to mention, playing around with electrical connections and pumping gas seems like asking for a trouble.

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Dan-IA

05-04-2007 21:12:20




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 Re: fuel pump question in reply to Blue3992 (N Illinois), 05-04-2007 20:55:51  
I changed the filter in my other car (which also gets driven regularly) when it suddenly left me stranded a few hundred miles from home. The resulting brown stains on my arms and shirt tell me that there's a lot of gunk that seems to live in the bottom of the tank.

Now seems like a good time to drain out the nasty stuff.

(Turned out to be the fuel pump in the Pontiac--I got it running by beating on the tank with a jack handle. That got me home.)

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Blue3992 (N Illinois)

05-04-2007 20:59:02




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 Re: fuel pump question in reply to Blue3992 (N Illinois), 05-04-2007 20:55:51  
Just gotta add: Those old Celebrity's are great. Relatively bulletproof, lots of room on the inside, just a good, simple car. Not really great at anything, but good at everything.



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