Fuel Sending Unit Installation Tip
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Mountain Pass
Joined: May 2018
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Likes: 12
Fuel Sending Unit Installation Tip
When installing a new Fuel Sending Unit especially in an older truck, throw away the gasket and bed the Sending Unit in a gas resistant sealent.
Thanks
mjac
Thanks
mjac
Last edited by Mjac167; Oct 27, 2025 at 08:47 PM.
More Turbo
Joined: Aug 2017
Posts: 507
Likes: 69
From: Tucson
How long has it been used in your van? Most RTV is not resistant to gasoline and it doesn't seem like ACDelco 10-2006 is either. It's advertised as resistant to oil and coolants as an "engine sealant" but it is not promoted as a "fuel pump sealant". Do you have some documentation that says otherwise?
Last edited by econo93; Oct 27, 2025 at 08:03 PM.
Thread Starter
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Mountain Pass
Joined: May 2018
Posts: 217
Likes: 12
How long has it been used in your van? Most RTV is not resistant to gasoline and it doesn't seem like ACDelco 10-2006 is either. It's advertised as resistant to oil and coolants as an "engine sealant" but it is not promoted as a "fuel pump sealant". Do you have some documentation that says otherwise?
Thanks
mjac
Hotshot
Joined: Jul 2020
Posts: 10,401
Likes: 2,607
From: Near Salt Lake City
Sealer for gasoline?
They do make putty epoxy that will stand up to gasoline for wooden boat fuel tanks
I use it on gas tanks when I cannot fins another tank and welding is not an option
Marine epoxy and it's white
Just use a new O-ring each time or let the old one dry out for a week
Those O-rings like to expand and then do not fit the groove well
If you be real careful, you can watch the pump go down and the O-ring seat in the groove as you go down with the pump
That's what I do
I ABSOLUTELY watch the pump go down and hit the O-ring, verifying it's still in the groove
That's the best way to prevent a recheck
They do make putty epoxy that will stand up to gasoline for wooden boat fuel tanks
I use it on gas tanks when I cannot fins another tank and welding is not an option
Marine epoxy and it's white
Just use a new O-ring each time or let the old one dry out for a week
Those O-rings like to expand and then do not fit the groove well
If you be real careful, you can watch the pump go down and the O-ring seat in the groove as you go down with the pump
That's what I do
I ABSOLUTELY watch the pump go down and hit the O-ring, verifying it's still in the groove
That's the best way to prevent a recheck
Thread Starter
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Mountain Pass
Joined: May 2018
Posts: 217
Likes: 12
Permatex Permashield Sealant
I used the wrong sealant, ACDelco 19-2006 engine sealant, I forgot it wasn’t for gas, but all I know, is when I embedded that sending unit flange in that ACDelco, all of my issues were resolved. Seems like more of s sure thing with an old tank with the neck possibly dented or bent and the tabs bent or worn. Just my guess.
mjac
I used the wrong sealant, ACDelco 19-2006 engine sealant, I forgot it wasn’t for gas, but all I know, is when I embedded that sending unit flange in that ACDelco, all of my issues were resolved. Seems like more of s sure thing with an old tank with the neck possibly dented or bent and the tabs bent or worn. Just my guess.
mjac
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