Gas Cap Leak

[sours]

I bought my 66 stout from the original owner who told me that the gas cap leaks. That is when you go around a corner the gas sloshes out through the cap. His solution was just to never fill it up past half full and then the gas couldn't make to the cap. This made sense to me so that is what I have been doing for the last 12 years. It dawned on me today that somebody out there might have a solution that does not have me get rid of my original stock gas cap. I don't want to lose it because it has the cool Toyota symbol like the hubcaps and besides I can't find another one. Has anybody else run into this problem? Is it common? Is there a fix?

[Carlyn Dinkler]

Try to order the gas cap & the gasket:
77310-35010 cap
90430-40059 gasket, gas cap

Either one may solve the problem. Carlyn Dinkler, [e-mail]

[sours]

From my local Toyota dealer that I have to show the truck to prove that they exist? Probably call Cabe.

[toyotageek]

I'll look up the numbers on Monday and let you know availability.

I'm guessing the original cap with the old logo will be discontinued, or change to a new number (design), but the gasket might still be available.

[1982rn34]

I agree with Mike that the cap with the old design would have been long discontinued and superceeded with the newer design. My power steering cap is metal with the TOYODA stamping
on it. This supercession updates the cap to a plastic one

Both part numbers still show good through Toyota, but Mike will have to check Dealer Daily to find any stock in the country. Mike - just to give you a hand...it will under PNC 77031 & 77031B.

Is the Stout catalog still on Microfiche or in electronic form?

[toyotageek]

The gas caps are still available, although I don't think they are the same as the original. They come with a seal fitted into the cap. See the photos below.

77310-35010





The gasket 90430-40059 is listed as "not available" but Toyota still shows 14 in stock at the National Parts Center in Ontario. Not sure what they look like or where they fit, but I will try to order some to see if we can still get them.

[Carlyn Dinkler]

The picture of the new cap 77310-35010 looks much like the 'picture' in the Stout parts book (mine is a paper book reproduction No. 93351-64 that came from Mike B. at Cabe) less the chain.

If you wanted to use your original cap, then I suggest you replated it in yellow zinc and install a new gasket, 90430-40059, while a few are still available.

Carlyn Dinkler, [e-mail]

[sours]

Thanks to all. I ordered a new cap and gasket from Cabe today. I wish I would have asked years ago.

[Frenchy Dehoux]

For all your needs Cabe Brothers should be the first phone call to make in my book. They have been around for a while. They are the best and very dedicated o the hobby.

Thanks !!!

Frenchy

[sours]

Well... I got the new cap last night and put it on but it has not solved the problem. Does anybody have another idea?

[mnstout]

Is the gas coming from underneath the cap? If so, you may need a thicker gasket to get a good compression between cap and the filler tube. There seems to be some play between the gasket and the wall of the cap. Rubber deflects, so you'd lose some of the force filling up this area.

Maybe some damage at the filler lip at some point? Are there other areas that are causing the leak?

On a different note, depending on when the gasket was manufactured, and what is called out on the print for physical requirements, it may be of a variety that was fuel resistant for mixtures available at the time, but maybe not so with the blends that are prevalent at the pump today. Nitrile (Buna N) was and is still in use today, but without proper compounding can be readily oxidized and lead to premature failure. A fluoroelastomer will perform better and will be less likely to permeate fumes. Some would say it's overkill, but if it can help keep it from just going into the atmosphere, I'd say it's worth it.

I'll send you a replacement and let us know if it works for you.

[Carlyn Dinkler]

On the early vehicles including most of the early Coronas, the gas cap is vented to the atmosphere thru a small vent hole. If you try to use a later cap with a valve, a vacuum is created as the fuel pump pulls fuel out of the tank (a bad thing!). So a new cap (which should have solved the problem) should seal so that fuel does not slosh out but fumes will still escape thru the vent hole. Check to see why the new cap does not screw down tight to the filler tube and try to correct that.
Carlyn Dinkler [e-mail]

[sours]

As near as I can tell it is leaking around the cap. I'm not really sure how though. The end of the filler tube is smooth with no dents or scratches, the cap seams tight and there is a mark in the seal from the filler tube has been pressed into it. However, there does not seem to be any other spot it could be leaking and the seal is wet on the outside of the indentation made by the filler tube. I have a parts truck I could try switching out the tube but normally parts from that truck are in poorer condition than my original. There is a return tube to the tank from the top of the filler tube that I assume has something with the venting issue, but there is never any gas around it. I'm kind of at a loss.

[toyotageek]

Not sure if it will help diagnose anything, but can you post up some pictures of the filler tube and area of leakage? I don't have a Stout at my disposal, but I'll ask some of my former Stout owner co-workers if they have any ideas...