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Post Info TOPIC: Any tip for installing fuel tank sending unit gasket?
jim larson


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Any tip for installing fuel tank sending unit gasket?
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Yes first time with more than  6 gallons of gas.   So out it must come, no lift  in my garage. Hope it’s just the gasket. My first hope gas line proved not to be true.

 

any special installation tips. I was told to install dielectric grease on O rings and any gasket surface that something turned on like the fuel bowl bolts. 



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Jim L

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I don't use any lube on the o-ring, as it is under the sender and the lock ring rotates on the metal plate. Your o-ring is probably just old and dried out. Nothing personal there, just fact...razz

A new o-ring should fix the problem.



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Mitch D.   River Falls, WI

Lifetime member of the "Cars apart Club"

Some Assembly Required

1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS 350 rs
jim larson


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Lost in the 60s wrote:

I don't use any lube on the o-ring, as it is under the sender and the lock ring rotates on the metal plate. Your o-ring is probably just old and dried out. Nothing personal there, just fact...razz

A new o-ring should fix the problem.

 Thanks Mitch. Hope to see you on the cruise Saturday.



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Jim L

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You probably already know this, but raising the front of the car quite high will put the gas at the rear of the tank and you can remove the sender without draining the tank. Nice feature on these cars, versus most others.

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Mitch D.   River Falls, WI

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1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS 350 rs
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Lost in the 60s wrote:

You probably already know this, but raising the front of the car quite high will put the gas at the rear of the tank and you can remove the sender without draining the tank. Nice feature on these cars, versus most others.

 Yes I was considering that, also the old and tired hose method.  So there is enough room to tap the tabs around with a little screw driver?



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Jim L

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Plenty of room to remove the lock ring BUT use a blunt end punch, the sharp edge of a screw driver can/will cut off the ring tab. They don't move easy. Work all the way around, tapping every tab, or the ring gets off center and binds up too. Some penetrating oil before hand will help too.

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Mitch D.   River Falls, WI

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Some Assembly Required

1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS 350 rs
Bobs_Place


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A brass drift would be safer, no sparks created. Or start the ring with the steel than switch to wood to finish spinning the ring. Assemble with the wood and if need be a steel drift once the sender is in place.



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Bob W.

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A brass drift would be good, but I've never gotten a ring to move with wood...it just splits from the sharp edge of the tab.

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Mitch D.   River Falls, WI

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1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS 350 rs
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I’ve always used a little bit of lubricant on O rings. It affords the O ring a chance to seat and allows the toque to be distributed equally. Vaseline works well.
For sure use a brass punch or get a 3/8” oak dowel at the hardware store.

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Kevin

Northwestern Ohio
jim larson


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Well with no lift and wanting to make sure the sender weld was not leaking I pulled the tank today.  I may be lucky, with a little gas left in the tank I tiled it up to get gas to the gasket area but not the sender tube.  Appears to be leaking from gasket.  Sending unit looks good.  I plan to pull a vacuum just to make sure.



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Jim L

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jim larson


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Almost 99% sure it was gasket.  There is a tab on the gasket. Not sure where it goes, should have observed better. Her is a shot of where it appeared to be.  Anyone know for sure?



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Jim L

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Jim I have two questions.
Does your tank have a return line?
Is there a vent line?

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Kevin

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There is a separate nipple on the right side of the tank that connects to the vent tube, located in the trunk, with a large grommet.

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Mitch D.   River Falls, WI

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Thats were I’m going with my thought Mitch. I had one leak at the vent line connection because the hose clamp had come loose or I never got it tight. Difficult to troubleshoot because it will only leak when the tank is more than half full and or you tap the brakes. The fuel evaporates quickly leaving no evidence of a leak other than a small spot on the floor, but the fuel odor is very strong.

Did the A/C cars use fuel return line?

Did the vert have a different vent setup than the coupe? 



-- Edited by dashboard on Thursday 18th of June 2020 08:16:38 PM

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Kevin

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jim larson


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dashboard wrote:

Thats were I’m going with my thought Mitch. I had one leak at the vent line connection because the hose clamp had come loose or I never got it tight. Difficult to troubleshoot because it will only leak when the tank is more than half full and or you tap the brakes. The fuel evaporates quickly leaving no evidence of a leak other than a small spot on the floor, but the fuel odor is very strong.

Did the A/C cars use fuel return line?

Did the vert have a different vent setup than the coupe? 



-- Edited by dashboard on Thursday 18th of June 2020 08:16:38 PM

 2dr cp and convert are the same for a 66 chevelle as well as all the other 66 models except for the el Camino and station wagon I think.



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Jim L

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