Cleaning Petcock Screens in Fuel Tank

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Cleaning Petcock Screens in Fuel Tank

Post #1 by kjmarti2 » Tue Dec 03, 2019 2:33 pm

Hey Guys,

Got the fuel tank out of my '76 GL1000 over the long holiday weekend because it was absolutely FULL of rust. Took it to a radiator shop yesterday to have them de-rust and seal after which I plan to repaint it. Another look at the pictures I took inside the rusty tank shows the reserve petcock screen is pretty cruddy (I imagine the main is as well but I didn't get eyes on it). Is there anything special I need to do to clean the screens and whatever flowpath exists to the petcock, or will it be taken care of by the de-rusting process? I want to make sure once the tank gets reinstalled that the fuel has a clean unobstructed path to the carbs.

Thanks!
-Kyle

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Re: Cleaning Petcock Screens in Fuel Tank

Post #2 by Fred Camper » Tue Dec 03, 2019 3:30 pm

My 1976 has the reserve plugged so watching the thread with interest.
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Re: Cleaning Petcock Screens in Fuel Tank

Post #3 by rcmatt007 » Tue Dec 03, 2019 3:47 pm

de-rusting should clean the screen.... now it is gunk in the tube that is hard to clean out
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all it takes for evil to prosper is the want of a few good men to do nothing-Edmund Burke
The question is not how much time do you have, it is what you do with the time that you have Gandalf
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"it takes 10,000 hours to become an expert" ancient saying
78 constantly modified/customized since 1978, BOTM June 2015 de-evolving this very moment viewtopic.php?f=30&t=65511
76 Ltd "cookies bike" not ready for prime time,
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Re: Cleaning Petcock Screens in Fuel Tank

Post #4 by tomk1960 » Tue Dec 03, 2019 3:52 pm

My reserve screen (or the tube itself) appears to be plugged. The tank wasn't that rusty, but there was a small rust hole under the reserve screen area that I had welded and repaired. Perhaps the welding process plugged it up? I wonder if there is any type of flexible drill bit that could be snaked down to clear it out? That's preferable to the alternative, which is swapping out the tank for another one. :(
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Re: Cleaning Petcock Screens in Fuel Tank

Post #5 by rcmatt007 » Tue Dec 03, 2019 4:03 pm

I tried a speedometer cable... others claimed it worked... I think I finally used a syringe to put acid down the whole and a semi- rigged wire
-Rodger-
all it takes for evil to prosper is the want of a few good men to do nothing-Edmund Burke
The question is not how much time do you have, it is what you do with the time that you have Gandalf
"One of the greatest dignities of humankind is that each successive generation is invested in the welfare of each new generation." Fred Rodgers
"it takes 10,000 hours to become an expert" ancient saying
78 constantly modified/customized since 1978, BOTM June 2015 de-evolving this very moment viewtopic.php?f=30&t=65511
76 Ltd "cookies bike" not ready for prime time,
79 project, finished,
'86 1200 (Beth's) with motorvation sidecar, July 2017 BOTM
'17 HD Road king and 08 HD Heritage softail (Beth's). I guess you can say we have MBS

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Re: Cleaning Petcock Screens in Fuel Tank

Post #6 by kjmarti2 » Tue Dec 03, 2019 5:17 pm

I'm guessing the only access to those tubes is through the 2 holes at the petcock flange, and I don't think I was able to see the primary screen from either the gas cap hole or the sending unit hole. That makes me a bit nervous about sticking something through there, just gotta be careful I guess. I'm a little apprehensive about acid as well because I'm not sure if it'll eat away at the seal that the radiator shop will have put in to stop future rust from building up.

Anybody been successful getting tons of gunk out through the petcock holes? No idea what I'm dealing with in mine but I'm expecting the worst.

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Re: Cleaning Petcock Screens in Fuel Tank

Post #7 by pjlogue » Tue Dec 03, 2019 7:15 pm

If you got an old spedo cable and cut ~2-2.5" off the end and used a variable speed drill you could auger the tubes out carefully. I would alternate using the cable and then flush any gunk out with a thin tube you could stick down the hole and flush with carb cleaner. I would also make sure the end of the cable does not have a sharp edge so you don't chew a hole through the fuel tubes.

-P.

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Re: Cleaning Petcock Screens in Fuel Tank

Post #8 by pidjones » Tue Dec 03, 2019 8:05 pm

For viewing, buy a cheap ebay USB endoscope camera and tape it to a coat hanger wire.
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Re: Cleaning Petcock Screens in Fuel Tank

Post #9 by chewy999 » Wed Dec 04, 2019 8:07 am

When I cleaned my tubes out, with the reserve blocked, I used a length of cable in a drill set to anticlockwise to prevent the cable unravelling. Then on a slow speed I worked the cable into the tube, gently pushing the cable in and out to get through the blockage. Once I broke through, I set the drill to clockwise and repeated the process. This causes the strands on the cable to separate, so the strands then clean the inner surface of the tube. When I was happy, I then flushed the tubes with white vinegar, which is what I used to clean the inside of the tank. Worked for me!

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Re: Cleaning Petcock Screens in Fuel Tank

Post #10 by Shadowjack » Wed Dec 04, 2019 9:11 am

I used a piece of old speedo cable in a drill like Chewy999 as well. Works fine. The screens were so rusty they just broke out, though.

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Re: Cleaning Petcock Screens in Fuel Tank

Post #11 by gltriker » Wed Dec 04, 2019 11:27 am

Filtering screens?

See my post, #62.

It shows the Inside of trike's newly cleaned and coated fuel tank through the filler neck, and the fuel level sender unit opening, too.
viewtopic.php?f=30&t=39996&start=60


Scroll down this page to Similar Topics, too.tumb2
Cliff

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RE: a thorough fuel tank cleaning
"And your carbs will thank you. They no longer live down stream from a sewage plant." -gregforesi tumb2
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'75 GL1000 home built trike; http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
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Re: Cleaning Petcock Screens in Fuel Tank

Post #12 by kjmarti2 » Wed Dec 04, 2019 6:56 pm

Wow Cliff, your tank is very alien-esque. Mine is covered in a thick white pasty seal. Talked to the radiator guys when I picked it up today and they used compressed air as well to minimize the amount of seal that dried on the screens. Seems like they used a combination of heat, acid down the tubes before applying the seal, and compressed air. Will post before/after pics later this evening.

-Kyle

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Re: Cleaning Petcock Screens in Fuel Tank

Post #13 by gltriker » Thu Dec 05, 2019 1:16 am

kjmarti2 wrote:Wow Cliff, your tank is very alien-esque. Mine is covered in a thick white pasty seal. Talked to the radiator guys when I picked it up today and they used compressed air as well to minimize the amount of seal that dried on the screens. Seems like they used a combination of heat, acid down the tubes before applying the seal, and compressed air. Will post before/after pics later this evening.

-Kyle


Is the >thick white pasty seal< called Kreeme?
Cliff

Keep your eyes and ears open and you'll learn something new, everyday. tumb2

New users please visit our "Shop Talk" for common tips and help: <---jdvorchak
http://www.ngwclub.com/forum/page/ST :oldies

RE: a thorough fuel tank cleaning
"And your carbs will thank you. They no longer live down stream from a sewage plant." -gregforesi tumb2
"Can't see the paint when your looking thru the handlebars..........." -Oldewing ;)
"I'd rather Ride than Shine" -RAT tumb2 Me Too!!

Cliff

'75 GL1000 home built trike; http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
October,2017 BOTM :shock: https://nakedgoldwingsclub.com/forum/page/Welcome

previous rides:
1953 H-D Servi-car, naked, 1969-1978 (serial#53G1559 committed to memory!)
1980 CB900 Custom (triked) 1997-2003 .... R.I.P.

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Re: Cleaning Petcock Screens in Fuel Tank

Post #14 by rcmatt007 » Thu Dec 05, 2019 11:04 am

sure sounds like kreeme…. wonder if the did not get it cleaned out of the screens. Good luck getting kreeme out
-Rodger-
all it takes for evil to prosper is the want of a few good men to do nothing-Edmund Burke
The question is not how much time do you have, it is what you do with the time that you have Gandalf
"One of the greatest dignities of humankind is that each successive generation is invested in the welfare of each new generation." Fred Rodgers
"it takes 10,000 hours to become an expert" ancient saying
78 constantly modified/customized since 1978, BOTM June 2015 de-evolving this very moment viewtopic.php?f=30&t=65511
76 Ltd "cookies bike" not ready for prime time,
79 project, finished,
'86 1200 (Beth's) with motorvation sidecar, July 2017 BOTM
'17 HD Road king and 08 HD Heritage softail (Beth's). I guess you can say we have MBS

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Re: Cleaning Petcock Screens in Fuel Tank

Post #15 by pidjones » Fri Dec 06, 2019 10:18 am

Kreeme comes out easy. It is soluble in acetone - even when cured! I removed it from the screens on one of mine by inverting the tank in a clamp and positoning a medicine bottle of acetone over the screen with a coat hanger wire guided by watching on my USB endoscope. Duct taped it all in place and two days later the screen was fully cleared. Then I noticed the crappy coating job in the top of the tank and coating already peeling off. Ended up rolling the tank around with two gallons of acetone in it to fully remove the Kreeme.
"Love 'em all.... let God sort 'em out!"
2006 GL1800 - the Black Pearl
1979 GL1000 project - to be restored
1978 GL1000 with '75 engine - the Hunley
Ex '79 CB750F rat bike - the Rocket - SOLD!
Ex '86 SEi
Ex '77 GL1000
Ex '75 RD400
Ex '72 Penton 125 set up for flat track
Ex '73 RD250
Ex '68 TR6C - chopped


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