How To Clean and Repair Your Fuel Tank Sending Unit

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Paul Narramore
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Re: How To Clean and Repair Your Fuel Tank Sending Unit

#16

Post by Paul Narramore »

I have my sender unit out and am about to begin soaking it in White Vinegar as I have been unable to locate any Evapo-rust here. Although it doesn't work, my gauge is pretty clean with almost no corrosion, unlike those shown here. Lets see if cleaning gets it going again.
Present bikes -

BMW R100/7
1989 BMW R100GS-Paris Dakar
MZ ETZ250 Trials
1977 Honda GL1000 GoldWing
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salukispeed
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Re: How To Clean and Repair Your Fuel Tank Sending Unit

#17

Post by salukispeed »

A very nice write up for sure. Well done.
Honda 72 CL100 sold
74 CB750 K4 nice driver
1966 CA77/305 Dream nostalgic driver
84 GL1200I work in progress
1970 CT 70
1982 GL500 Interstate
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77Gowing
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Re: How To Clean and Repair Your Fuel Tank Sending Unit

#18

Post by 77Gowing »

Great write up!

Reg Phosphoric Acid: There's a product called Milkstone remover that is PA and is used for cleaning dairy farm equipment.
You can get it at Tractor Supply for about $12/gallon. I mix mine at ten parts water to one part PA and it is a wonderful rust remover. It's also biodegradeable. I left the rear wheel spline hub in it for three days after forgetting about it and found that it does indeed slowly react to cast iron, I have the replacement part from Cyborg to prove it....Duh? Other than this one problem using PA, I've cleaned lots of flash rusted chrome with it. I use a fifteen gallon kitchen trash can with a lid as my vat of rust remover. I've been using the same batch for two years and it's still active, though I need it down and clean out the sediment. It looks nasty but it works.

Fer whut it's worth fellas.
"Less is More" Anonymous

77Gowing
1977 GL1000 "O'le Blue." (sold :crying)
2014 Yamaha 950 V Star (sold)
2017 Indian Scout Std w/ABS (sold)
2009 Honda VTX1300R "Me Brudder's" (sold)
1984 Honda Interstate "84' 2outa4." Gone
1982 Honda GL1100 "After thought." Gone
Paul Narramore
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Joined: Wed Dec 17, 2014 6:18 am
Location: Aylesford, Kent, UK

Re: How To Clean and Repair Your Fuel Tank Sending Unit

#19

Post by Paul Narramore »

Two days soaking in a small cup of wine vinegar and after a quick rub down with a cloth, it looks like new. A tweak to the tiny screw to ensure the arm rubs along the fine wires (I don't think it did before) and I'm just waiting for the special petrol-resistant sealant to arrive in the post.
Present bikes -

BMW R100/7
1989 BMW R100GS-Paris Dakar
MZ ETZ250 Trials
1977 Honda GL1000 GoldWing
Paul Narramore
Titanium Member
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Posts: 367
Joined: Wed Dec 17, 2014 6:18 am
Location: Aylesford, Kent, UK

Re: How To Clean and Repair Your Fuel Tank Sending Unit

#20

Post by Paul Narramore »

OK, it's been a little while now. I cleaned up the sender unit, it really wasn't that rusty, and tested it using my multimeter. All seemed OK. Replaced it, connected everything up and.............the fuel gauge still swings over to 'full' even though it's a half full tank. I have removed the fuel gauge but how (using my multimeter) can I check it? I don't want to buy another unless I really need to and if this one's OK and the fault lies elsewhere.
Present bikes -

BMW R100/7
1989 BMW R100GS-Paris Dakar
MZ ETZ250 Trials
1977 Honda GL1000 GoldWing
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gltriker
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Re: How To Clean and Repair Your Fuel Tank Sending Unit

#21

Post by gltriker »

There is a 7volt regulator mounted on the left side of the shelter frame that may not be working correctly.
Its only purpose is to provide 7volts positive to the fuel gauge and the engine coolant temperature gauge.
Check its output voltage. Overvoltage may be as simple as an insufficient ground path connection to the 7volt regulator.
If the temperature gauge is also pegging into the hot zone, although the engine is cold, that is an indicator that the 7volt regulator isn't doing its job.
Been there-Done that!
Cliff (74yrs ;) )

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
^^^^^^^click up here^^^^^ :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.
Paul Narramore
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Joined: Wed Dec 17, 2014 6:18 am
Location: Aylesford, Kent, UK

Re: How To Clean and Repair Your Fuel Tank Sending Unit

#22

Post by Paul Narramore »

I do know for sure that the temperature gauge DOES work as it should. However I will check the 7v supply.
Present bikes -

BMW R100/7
1989 BMW R100GS-Paris Dakar
MZ ETZ250 Trials
1977 Honda GL1000 GoldWing
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