Posted by Owen Aaland on July 30, 2012 at 00:17:49 from (216.47.35.172):
In Reply to: gas cap style posted by mkirsch on July 29, 2012 at 17:39:31:
Paulginmn said: (quoted from post at 20:39:31 07/29/12) when did they change from the short gas cap to the tall ones? Did all H's and M's have the short ones? Paul
The "new" style, triple baffled, caps were first available in the late '50's or some time in the '60's.
The original caps had their vents on the underside of the cap. In an attempt to limit fuel leaking due to splashing in the tank the designed was changed to a single vent in the top center of the cap. In a further attempt to limit the problem the design was changed to a triple baffle design the required a taller cap. This design also had one single vent in the top of the cap.
The law suits dealt with pressure building up in the tank and being released suddenly when the cap was removed. This was due to the vent plugging on the top of the tank. The sudden release of so many vapors was blamed for many fires.
The current design includes two vents on the top of the tank plus a double latch on the bottom so the cap can not blow off if there is pressure in the tank and the cap is removed rapidly. The cap must be turned another 1/4 turn or so after it is loose before it can be removed from the tank filler opening.
The free gas cap replacement program is for gasoline engine tractors that have fuel tanks mounted above and behind the engine. Diesel engine tractors and those that have the fuel tank located behind the operator seat do not qualify for the free cap. The fuel cap replacement program is a liability that Tenneco did not assume when they bought the IH Agricultural Equipment Division. That is why it is still handled by Navistar.
This post was edited by Owen Aaland at 15:04:41 07/31/12.
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