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Fuel pump Guru?
Post by vrod02 on Nov 26, 2006, 4:55pm
So I'm having interm. fuel pump issues. If it sits I have to prime it through the carb and then runs fine.This just started yesterday. Vacuum leak possibly? I was inside the engine compartment replacing my Heater core for the last time. Lots of fittings going to the pump.Thoght I might have bumped something loose but looks ok.Whos got em?
Re: Fuel pump Guru?
Post by xjchief on Nov 26, 2006, 6:54pm
If you're running the stock engine driven pump you can get a rebuild kit from http://www.then-now.com. I'm at work so I don't know the part number or the contact info off hand... I think the kit ran like 40 bucks.
Simple fix.
Re: Fuel pump Guru?
Post by vrod02 on Nov 26, 2006, 7:27pm
Thanks XJ chief!
Re: Fuel pump Guru?
Post by robertcowan on Nov 26, 2006, 8:10pm
I BET THE ACCELERATOR PUMP IS BAD ON THE CARB.
Re: Fuel pump Guru?
Post by vrod02 on Nov 26, 2006, 8:11pm
Pulled the line leaving the pump at the filter. Had another crank it.Its dry.No pressure getting to the carb.
Re: Fuel pump Guru?
Post by barrman on Nov 26, 2006, 9:15pm
It reads like a fuel pump issue. But, these things had a "sock" type filter on the in tank pick up tube. Old gas sitting for decades makes them clog up. Try blowing some air from the fuel line on the drivers side frame rail back into the tank with the gas cap off. There is a rubber hose there that is easy to pull off is why I suggest that spot. At the pump is just as easy. Of course, that hose I mentioned could be cracked and not allowing your pump to make any vacuum in the line.
You probably have the right diagnosis, but thought I should mention some problems many other have had in the past.
Re: Fuel pump Guru?
Post by vrod02 on Nov 26, 2006, 9:36pm
Barrman, I appreciate the comment.I'd rather try that than be a parts replacer. Nothing worse IMO So I need to look at vacuum lines as well right?
Re: Fuel pump Guru?
Post by porkchop on Nov 27, 2006, 1:56am
No need to look at the vacum lines unless your wipers don't work. Have you tried them to see? The pump also runs them.
Re: Fuel pump Guru?
Post by boghog on Nov 27, 2006, 9:15am
Also make sure your fuel tank has at least 5 gal of fresh fuel. The gauge might be broke. You can also try a small can of gas under the truck and connected to the fuel pump with a short line to see if all is working well. Its just a matter of testing time, working your way back to the fuel supply. It sucks, ( well in this case it might not.lol.) but step by step work your way back to the tank.
Good luck, and let us know please what you find.
Dennis
mfs
Re: Fuel pump Guru?
Post by vrod02 on Nov 27, 2006, 8:17pm
Followed Barrmans advice, blew air reverse thought the tank and so far all good! Time will tell. Thanks again,I hate spending money.Swine the wipers work!
Re: Fuel pump Guru?
Post by barrman on Nov 28, 2006, 8:59am
Cool, it looks like you narrowed it down to a part you can work on while standing up. Always a good thing.
You are at the point were a lot of people have just unplugged the fuel lines from the mechanical pump, added an electric pump and left the mechanical pump to just power the wipers. Mine was that way when I got it and I know of at least 3 others just like it. The cost to you today is about the same. Just make sure you put a filter before and after the new electric pump. Preferrably one of those Fram G2 see through ones at Walmart. They are cheap, available in just about every town you will go to and actually work for most of the big chunks of junk floating around in your tank right now.
Re: Fuel pump Guru?
Post by xjchief on Nov 28, 2006, 1:16pm
Mine came with the electric pump the military probably installed. When it died it was actually cheaper to rebuild the mechanical pump than to replace the electric one. Also, I added a fuel filter off the line out of the tank and one after the pump. No telling what's in those lines after almost 40 years. I personally wouldn't use a Fram filter- even to make a pot of coffee.
Re: Fuel pump Guru?
Post by barrman on Nov 28, 2006, 3:42pm
I agree about the Fram usage except for this use only. They are cheap, you can see stuff building up and change them out. At least, that is what I do.
Re: Fuel pump Guru?
Post by vrod02 on Dec 1, 2006, 10:16pm
As I blew through it,in reverse, I could feel the pressure build and then woooffff!!! I need to drain the tank again.
Re: Fuel pump Guru?
Post by barrman on Dec 4, 2006, 10:04am
You might have blown the "sock" off. If so, then just put in some filters and drive it.