fuel tank o ring doesnt seat on lid when tank is closed

pelicanprentice

Active Member
Messages
68
hello! on my savage x 4.6 i noticed that the orange o ring for the fuel tank doesn't seem to seat nicely on the lid/cap. everytime i push the cap lid closed, the o ring seems to come out and it like half falls into the fuel tank opening. i inspected the o ring and it isnt brittle and looks perfectly like brand new. when i reinstall it on the lid it seats fine but when the lid is closed it seems to want to fall out as the tank kinda hits it at one side which makes it unseat

is the remedy just a new o ring? the old o ring looks compeletly fine.
anything else i can try or do to get it to seal?

thx
 

pelicanprentice

Active Member
Messages
68
Never had an issue with it like you describe, has the lid spring got bent & not closing square to top Of tank?

no it seems perfect the lid closes perfectly fine and the spring has tons of tension. i think its because the o ring isnt grasping onto the lid tightly so when the lid lowers into the cap and its time for the o ring to provide the seal, it kinda moves and ruins the seal. if that makes sense
 

birdman

Member
Messages
20
Location
Burlington, Ontario
I too seemed to have a solid closing issue. I used an old spring. connected it to the cap and hooked it under the tank. keeps it closed nice and tight.
 

ELWOOD

Well-Known Member
HPISF Supporter
Messages
482
Location
So.Cal.
@pelicanprentice

I CHECKED WITH HPI THEY STATED. THE FUEL LID O-RING IS A 2.4MM X 18.0MM. IT IS A BUNA-N TYPE "NITRILE" MATERIAL FOR THE 160CC FUEL TANK.
 

Jabbo

Active Member
Messages
98
I have a savage fuel tank that has this ring shape plastic from lid fallen off. Just eyeballing it and cant unerstand how its supposed to stay in there. Nothing seems broken. Wonder if theres any exploded view of the fuel tank somewhere?
 

Polar_Bus

Member
Messages
33
Funny you guys mention this , I had the same exact issue. What's happening is over a long period of time, nitro fluid is causing the tank lid o-ring to swell and not allow the lid to fully close. My savage 25 I bought around 2002 . I cant help you with an exact p/n for a replacement as I just used and oring that I had in my stash and it fit perfect. All's you need is an oring that will seal the inside diameter of the fuel tank opening. You also need the tank to hold pressure so blow into the exhaust pressure port on the cap, plug the fuel outlet port and verify the tank can hold pressure.
 

Jabbo

Active Member
Messages
98
Ok. Anybody know how that plastic part should be attached to fuel tank lid? Goes in and comes out freely. Its job seems to be hold gasket in place.
 

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pelicanprentice

Active Member
Messages
68
Ok. Anybody know how that plastic part should be attached to fuel tank lid? Goes in and comes out freely. Its job seems to be hold gasket in place.
for some reason i don't have that exact piece. let me look again maybe i dropped it
 

Jabbo

Active Member
Messages
98
I figured it out from other fuel gap. The circle ring inside the cap is held by small plastic clip. So if yours is lost then just glue that circle plastic to place.
 

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