Fuel Cap

This is the place to get help with technical matters concerning your M151 jeep

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kmam
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Fuel Cap

Unread post by kmam » January 19th, 2019, 3:59 pm

How can I tell if my fuel cap is vented or not?
Howard

Daimler Ferret Mk 1/2
AM General M151A2
Austin Champ

Hambone
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Re: Fuel Cap

Unread post by Hambone » January 19th, 2019, 5:57 pm

Doesn't it say on the outside? Does it have a valve on the inside that says open or closed? is it a round cap, round cap with dog ears(leg snagger) or the later one with lips?

kmam
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Re: Fuel Cap

Unread post by kmam » January 20th, 2019, 1:03 am

It looks like this:

Image

Image
Howard

Daimler Ferret Mk 1/2
AM General M151A2
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muttguru
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Re: Fuel Cap

Unread post by muttguru » January 20th, 2019, 8:49 am

That cap looks like something from an M38 or M38A1. It's an early-type cap (the trouser-ripper) but there doesn't appear to be a valve on it.

The question you should be asking is "What type of fuel tank and emissions system have I got?"

If you have an A2 with emission controls fitted, then you need a non-vented cap.
For ALL other types of fuel tank, you need a VENTED cap.

The cap you show does not have the OPEN/CLOSED valve on the inside of the cap.....
Ken
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Ken

Always wanted - Details and pictures of M416 Trailer data plates & M151 data plates & body-tags for my research. Thanks!

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Note for 2023..... Ken..."Less Stress - More Exercise!"

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rickf
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Re: Fuel Cap

Unread post by rickf » January 20th, 2019, 10:43 am

I does not have it in the picture but I think it is supposed to and it is missing. The dimples for holding the valve in position are there. it looks like the valve is there. You can use a vented cap on an emissions system but it will negate the proper use of the emissions system. You cannot use an emissions, non-vented cap on an older non emissions system. That said, I still have not proven out that the vent lint from the tank to the air cleaner will not let air go both ways. If it will then a closed vent on the cap will not prevent the engine from running since the tank will get air from the air cleaner through that vent line. The one tank I checked did not have a one way valve in it. I do not know if there is supposed to be a valve in there.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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m3a1
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Re: Fuel Cap

Unread post by m3a1 » January 20th, 2019, 11:28 am

May very well be they used up some existing stores of parts when building that cap and just didn't fit the additional parts to it, Rick. We've all seen that sort of thing before.

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rickf
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Re: Fuel Cap

Unread post by rickf » January 20th, 2019, 11:37 am

This is true, That could also have been a picture of one that was restored and the little metal tab that operates the valve has rotted away. Seen that many times also. I even have one or two of them.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

Mark
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Re: Fuel Cap

Unread post by Mark » January 20th, 2019, 10:11 pm

mark


1968 m274A5
1960 m151
1981 m151A2
1964 m416
1971 m416

Mark
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Re: Fuel Cap

Unread post by Mark » January 21st, 2019, 11:27 am

Did the picture show when clicking on it?When I click on it, sarfari can't open it
mark


1968 m274A5
1960 m151
1981 m151A2
1964 m416
1971 m416

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m75
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Re: Fuel Cap

Unread post by m75 » January 21st, 2019, 12:04 pm

Seems like the link is incomplete. I believe there should be an "img" indicator at the front, as well as the end of the link.

I've been wrong before.....
Jim Peterson
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1961 M151 -Sold
1974 M151A2, Working It!

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Re: Fuel Cap

Unread post by Surveyor » January 21st, 2019, 12:21 pm

Code: Select all

[img]https://i.postimg.cc/fyw8hdQ7/IMG-2328.jpg://i.postimg.cc/fyw8hdQ7/IMG-2328.jpg[/img]

Image
1960 M151 Run #1
"There is one nut on a M151 that is very difficult to remove....." - K8icu
"She ain't a Cadillac and she ain't a Rolls, But there ain't nothin' wrong with the radio" - Aaron Tippin
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Mark
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Re: Fuel Cap

Unread post by Mark » January 21st, 2019, 2:23 pm

Image
mark


1968 m274A5
1960 m151
1981 m151A2
1964 m416
1971 m416

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