ron74887 wrote:Goerge, they do not have a check-valve per say, but the way they are made have a rubber seal that allows air to come in yet not go out acting as a check. ... Ron
WRONG.. Oh, Palm-Tree Feller!
All they have is a hole punched in the center of the cap.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
Damn you're qiuck. I'll have to look at mine but I think they have a rubber seal(flap) over the hole. I painted mine and put a decal for fuel quantity and octane rating on the inner circle and don't even remember the hole. That's bad (normal) Ron
President 86-88
53 C170-B N74887, people choice 2003, Best original B 2007
46 7BCM champ N2843E Rebuilding stage
Cajun Connection way down south, most of you are yankees to me!
They're good caps. They'e inexpensive too. I wish they were legal. (At least their gaskets are a perfect fit for genuine Cessna fuel and oil-filler caps.)
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
No never noticed that. Wonder if that is for the gasket, aluminum or just what part is not compatible????? maybe that little rubber yours didn't have. Ron
President 86-88
53 C170-B N74887, people choice 2003, Best original B 2007
46 7BCM champ N2843E Rebuilding stage
Cajun Connection way down south, most of you are yankees to me!
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
There goes that TEXASS ego again. My caps don't look like that at all. They have two holes drilled at the inside flanges that vent to the underside a of the cap and also to the inside of the rubber gasket. I ordered them from AS but do not have the part nos. that I know of--unless the AI put them on the annual paperwork after it was painted. Will look. I don't know if they would vent fuel out because of low pressure like the one in the pic. I would think that one would vent fuel all the time. I do have a few stains but not real sure where it is coming from. Ron
President 86-88
53 C170-B N74887, people choice 2003, Best original B 2007
46 7BCM champ N2843E Rebuilding stage
Cajun Connection way down south, most of you are yankees to me!
I think I've seen what you are describing, Ron... and if I'm correct, those are automotive fuel caps, perhaps made by Stant. If they "vent" to the INSIDE of the gaskets, then they do not really "vent".
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
Word game again--they vent to the top side of the flange on the inside dia. of the gasket. If that isn't as clear as mud. I not sure I can describe it any better. Consider two pieces a flange and a cover. On your picture the hole is drill on the flange lip (curve) just above the tabs that locks the cap in place. Then it vents to the underside of the cover. I may have to take a pic and email it to you. I was just wondering if there is a low pressure under the cap (cover). Ron
President 86-88
53 C170-B N74887, people choice 2003, Best original B 2007
46 7BCM champ N2843E Rebuilding stage
Cajun Connection way down south, most of you are yankees to me!
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
Ron/George, your mentioning of the fuel caps reminds me that for several years, up until late last year, I had purchased and used fuel caps that came from O'Riley's Auto Parts that were made to fit older Ford (and probably Chevy & others) pickup trucks that had the fuel spout sticking out of the cab. Former and deceased member Goody Goodrich put me on to them. They cost $6-$8, were polished aluminum or stainless (?), were/are vented and fit like a glove on our fuel tanks. Only problem is there isn't an easy way to connect the retaining chain. They certainly work as well as the rather expensive "official/approved" ones. And yes, George, I know, they are illegal
I thought of an odd question while I was driving through the rain. I want to do some light IFR in my plane this summer. If I were to be flying through the rain, would any amount of rain, to be concerned about, enter my fuel system through the fuel vent or caps? I've never thought about it in any other plane because the fuel vent is located behind something.
Thanks
I have flown in rain that was continuous, and occasionally very heavy (could barely see the wingtips) and never experienced any problems.
<edit> And even if a few drops did enter the system the gascolator is intended to capture and hold it, to be drained next pre-flight.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
I contacted Steve and his son Brian of Steve's Aircraft about the fuel vent STC that he holds. This fuel vent gets rid of the overhead gooseneck vent. Instead of installing the vent line into the outboard end of the fuel tank like in later C-172s, Steve's vent does not modify the tanks at all. The vent T's into the overhead cross vent and then routes the vent over left fuel tank and out. The problem they are facing is with a required check valve. The one approved in the STC went from $40 to over $300. To use an alternate reasonably priced (read uncertified) valve they would have to come up with an approved test procedure to insure the break-out pressures are as advertised on each valve. Because of this issue this STC is on the back burner. But he said, "maybe your interest could get us looking for a valve again."
