Gas caps

DPittman · Oct 31, 2016

I'm sure this is a problem with a lot of different tractors, so maybe someone can tell me what kind of gasket material to use to keep the gas caps on these Molines from leaking. Maybe something I should be looking for on the filler neck itself? I can't see where they're messed up or bent, unless they're all messed up. Thanks for your input.

Janicholson · Oct 31, 2016

Gas caps are prone to leaking from sloshing fuel and weak cap dogs and bent tank flanges. The best gaskets are Buna-N based material or Neoprene. Cork seems to fail from the start. Look at the tank flanges for bent cam lips and flatness of the seal surface. IH is still replacing caps on Farmalls for that reason. In addition, the short caps may have little or no baffling in the dome of the cap letting slosh get to the vent hole. More modern tanks have a baffle or DIP tub in the neck to limit slosh at the cap. Jim

RayP(MI) · Oct 31, 2016

Don't fill the tank so full. Maybe 2/3 is a practical limit. Have had that problem with my Farmalls even with their new caps. No so much with my Deere.

David G · Oct 31, 2016

I have had better luck with the tall caps that came out for the farmalls.

dr sportster · Oct 31, 2016

Take and exhaust pipe and and smaller pipe sharpen up the edge for gasket cutter and you can cut gas cap gaskets out of cork , inner tube ,leather, double them up, anything you want. One rubber one paper will stop leaking.

47fivewindow · Oct 31, 2016

At the IH dealer, we had a tool that reshaped the tank neck if it had become out of true. I've never seen one since. It slipped in and tightened. Is such a tool available?

S2710 · Oct 31, 2016

Pilot Knob restorations in Galena Ill sells them and they work real well. I have repaired over a dozen so far.

Bob

C. Amick · Oct 31, 2016

I would try making the rubber impregnated cork gasket. You can buy rolls of it at your auto parts store. A rubber gasket (depending on the type of rubber)is probably going to swell due to the ethanol.

notjustair · Oct 31, 2016

My Farmall/International A, M, and 886 all slosh and leak if filled to the top. This is with the tall cap. I do like those since there is more for my old hands to grip. The M fits very tight but will still seep. I put the tall cap on the 886 because I thought the old cap was shot. It weeps from the sending unit and fuel cap. I think all of those 86 series did.

Rich'sToys · Oct 31, 2016

I've never seen a Moline tank that didn't leak around the cap. Most of them have no paint left around the cap area.

dr sportster · Nov 2, 2016

If you make the gasket punch I describe and experiment with different materials you will never have a leaky cap. I just keep adding gaskets until I have no leaks . None of my caps leak.

Gas caps

DPittman

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Janicholson

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RayP(MI)

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David G

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dr sportster

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47fivewindow

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S2710

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C. Amick

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notjustair

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Rich'sToys

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dr sportster

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