Well i have some bad news.
My 71 has been having alot of troubles running. ALOT. Mostly based on it vapor locking and troubles with my carb. well i decided to pull my fuel pump and clean it. Good idea....... Bad results.

I get it opened up to see the fuel filter. And it is filled with what looks like coffee grounds and tobacco. But upon closer inspection it looks to me like rust. about 1-2 tablespoons worth. Not counting what came out when i drained the gas.

Should i remove my cab tank and clean it out? And how would i go about doing that?

I will get some pictures of it up tomorrow morning some time.

Good news is i just got a new fuel filter before the pump.

 

lilsmokey, all that brown stuff had to come from the tank or the fuel line or both. Pull the tank, just look and you will find the bolts that hold it in. Disconnect the fuel line,evap line if it has one, unplug the fuel sender wires, disconnect the filler tube from the tank then have someone help you take it out. Plug the evap pipe outlet and the filler tube then remove the sending unit, be careful with it as they are easy to break. Dump out the old gas into a 5 gallon bucket, you wont get it all out the first time and I typically don't like to keep putting gas back in(fire and explosion hazard) so let it dry out then I just use water for the rest of the time. Make sure that rust is the real problem and not a product of someone putting a pound of coffee grounds in the gas tank for whatever reason.I used some short lengths of galvanized chain and some small chunks of sharp cornered metal in the tank to clean it out. It had a small amount of rust so it cleaned up pretty good, we added some water, spun it around, shook it back and forth and up and down for a long time then drained it out and did it some more. It took a lot of time but it came out pretty clean. Don't forget to check the fuel line from the tank to the fuel pump it could be packed with the same crud as the fuel filter, you may have to get a new fuel line if the old one can't be cleaned out.I would also check the upper fuel line and the float bowl on the carb for crud. If it was rust in the tank I would also put a new fuel pump in as the old one may have been damaged by the rust crud. Also now is a good time to check the fuel sender for damage such as a hole in the float or to replace a bad sender unit. Also a good time to replace filler neck grommets, filler neck to tank hoses, fuel evap hoses and any other hose that attaches to the fuel tank. They do make fuel tank repair coatings for the inside of the tank but I have never used them. Hope you get it figured out.

"bowties in the rearview mirror"

 

I had a similar issue, my truck lost power on the first trial run on new engine rebuild. I pulled the tank dumped it, put about a gallon of new gas in, shook it dumped it, & fortunately I didn't have the buildup that Nod & others have had. You may not either. The filter is doing it's job.

Look into the tank and decide what you need to do to proceed. You can drain the tank by removing the gas line below the truck if there is a lot of gas in it.

You also might get by with filter replacement with out pulling the tank.




John

 

if you don't have a chain a handful or two of nuts and bolts does the job too .

to chase the last of the water out dump a whole bottle of rubbing alcohol in the tank shake around and dump . the alcohol will evaporate leaving a clean tank .

 

The 19 1/2 gallon in-cab fuel tank (DOTZ-9002-A) has been reproduced by Blue Oval Truck Parts (Anaheim CA). Available from other repop sellers.

Originally, this was also the FoMoCo service part replacement for the C1TZ-9002-K 18 gallon in-cab tank.

Applications: 1970/72 F100/750 / 1961/69 F100/750 / 1963/67 N500/600 / 1967/79 F800/1000.

 

I used the POR-15 fuel tank restoration kit. It's about $75 and comes with everything needed except water. It cleans, plugs and seals. I also suggest changing the sender unit and rubber fill neck while you have the tank out. They are cheap and easy to do for many years of worry free service.

http://www.por15.com/FUEL-TANK-REPAI...ductinfo/FTRK/

 

Here are the pics.

 

looks like 40 year old crud , had the same in my filter even though tank is clean . i replaced the fuel pump with filter for a just fuel pump out of a 67 tbird 390 and added a glass inline filter .
I know some on here say the glass filters are a hazard and can break , i made a bracket that holds filter away from everything and use zip ties to hold fuel line to bracket . so no chances of it breaking .

 

Mike, I did the same thing to mine years ago and havent had any problems with the see through filter. At least if the filter is stopped up we will know it!

 

Well today was productive. I put a new fuel filter right under the cab, got a new electric pump and got a new dirt bike. A 1998 Yamaha yzf400.

the new pump worked fine on my dads mg about a week ago but today i am getting nothing out of it. I have it bolted to my inner fender and all the correct lines going to and from it. When i turn it on it does work but i havent gotten any gas to pump trough it. Any special way these things are supposed to work?

The truck only has about a gallon of gas in the tank so now im just hoping im to empty for it to get to my lines. Ill throw a few bucks in it tomorrow and see if i can get it pumping correctly.

I will clean the trucks tank out some time in the next month or so but no im in to much of a need of it to do to much work now. If all else fails and its to dirty ill throw some clean gas in my drivers saddle tank and run that for a while.

Thanks for all the help guys.

 

Tomorrow when working on the new pump ill look at the gunk more closely. I have never had dirty gas come out of the tank before so maybe it is just 41 year old dirt.

 

Looks like maybe someone dumped something in the tank. The filter is not that bad for a rusted up system.

I think if I had this truck, I would pull the tank and rinse it with clean gas, then look in it with a good light. I have a hunch that it is not that bad in there. Get an air hose and blow the gas line at the pump back into the tank before you start, you could have some crud in it that is hurting flow. Stick with factory type pump with filter as seen in photo.

I think it will clean up and work properly.



John

 

electric fuel pumps are better pushers than pullers, best to mount it as close to the tank as possible.

 

Just jumping in here about the vapor lock. I couldn't take my truck to town 5 miles without having to hang out for half an hour to start it again. When i replaced my fuel pump the parts store had this flexible fuel line, not sure who makes it, but it is a flexible metal and OD green color. I ran it over the top instead of through where the heat happens below. That was about a year ago. Not one vapor lock, even when it gets triple digits here. Best thing ever. I have a holley 2bb carb with a K&N oil air cleaner and filter on top also.