Petcock Valve and Fuel Line Clamps


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GBKid
Posts: 43
Joined: Fri Jul 03, 2015 9:54 pm
Location: Oostburg, WI
Motorcycle: 1989 GL1500

Petcock Valve and Fuel Line Clamps

Postby GBKid » Wed Jun 22, 2016 7:00 am



Recently, I rebuilt the vacuum operated petcock valve located near the fuel filler cap. The diaphragms were degraded and the fuel shut-off diaphragm portion had 4 tiny holes in it allowing fuel to pass through and drain through the petcock check hole into the filler cap overflow tray (see diaphragm photos). I purchased a Show Chrome rebuild kit online and the repair of the petcock valve itself went off without a hitch. However, the previous owner had replaced the fuel filter at one time and instead of using the original fuel line compression clamps, screw band clamps were used instead creating deformity of the fuel line. I did not realize this until I put everything back together using the same screw band clamps on the old fuel lines. I later could still smell the odor of fuel and discovered fuel weeping from the fuel line connections. I ordered the OEM formed fuel line pieces and associated compression clamps and a new fuel filter from Honda and fixed that fuel leak (see photo). The point here is to never use the screw clamps unless you're in a pinch. The original compression clamps provide the necessary amount of sealing pressure without deforming the fuel line allowing reuse when replacing the fuel filter. The good news is my MPG increased about 2-3 MPG!
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FM-USA
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Re: Petcock Valve and Fuel Line Clamps

Postby FM-USA » Wed Jun 22, 2016 10:10 am

I used to use those screw clamps on everything until CCC (Cheap China Crap) flooded the market (CCC should be outlawed).
Where ever I can use the spring clamps I do. Where I can't (and if there's room) I double them up.

"HD on the side of the road" (sounds like a jokes beginning) had a leaky fuel filter at both outlets. Yup, he had screw clamps. I carry spare spring clamps and helped the dude out. He pulled a scrunched-bunch of singles from his pocket, I said, "Get extra of these clamps and pay it forward".
"OIL CHANGE?" _FM 07-2009
Know its new taste and be loyal, you'll know when to change that oil.
Taste testing as the miles flow, souring as that acid grows.
And don't flirt with dirt or darkened oil, all the faster your engine will spoil.

GBKid
Posts: 43
Joined: Fri Jul 03, 2015 9:54 pm
Location: Oostburg, WI
Motorcycle: 1989 GL1500

Re: Petcock Valve and Fuel Line Clamps

Postby GBKid » Wed Jun 22, 2016 10:44 am

That's right, they are called spring clamps. I called them compression clamps. I couldn't think of the proper name. Thanks. And you're right FM-USA. It's all about Paying it Forward like this site does.

GBKid
Posts: 43
Joined: Fri Jul 03, 2015 9:54 pm
Location: Oostburg, WI
Motorcycle: 1989 GL1500

Re: Petcock Valve and Fuel Line Clamps

Postby GBKid » Wed Jun 22, 2016 10:47 am

GBKid wrote:Recently, I rebuilt the vacuum operated petcock valve located near the fuel filler cap. The diaphragms were degraded and the fuel shut-off diaphragm portion had 4 tiny holes in it allowing fuel to pass through and drain through the petcock check hole into the filler cap overflow tray (see diaphragm photos). I purchased a Show Chrome rebuild kit online and the repair of the petcock valve itself went off without a hitch. However, the previous owner had replaced the fuel filter at one time and instead of using the original fuel line spring clamps, screw band clamps were used instead creating deformity of the fuel line. I did not realize this until I put everything back together using the same screw band clamps on the old fuel lines. I later could still smell the odor of fuel and discovered fuel weeping from the fuel line connections. I ordered the OEM formed fuel line pieces and associated spring clamps and a new fuel filter from Honda and fixed that fuel leak (see photo). The point here is to never use the screw clamps unless you're in a pinch. The original spring clamps provide the necessary amount of sealing pressure without deforming the fuel line allowing reuse when replacing the fuel filter. The good news is my MPG increased about 2-3 MPG!




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