fuel tank, selector valve and remote for MKII Carrier

[Robert Bergeron]

Thanks Richard . Could someone chime in and tell me the size of the fittings and type of thread please ?

[Jacques Reed]

Hi Robert,

I might be way off base but it looks very similar to a Ford CMP truck 3 way valve. Hopefully something that was standardized.

If similar size inlets, they are 1/8 NPT male to 1/4 SAE female inverted flare fittings. See attached photo. Note raised portion inside fitting which forms the seal with the double flare.

The trucks use 1/4" fuel lines and SAE male inverted flare fittings, same as the fittings on the brake lines. These brake and fuel line fittings are UNS Unified National Special and are 7/16” x 24 (parallel) threads per inch (A standard 7/16” UNF thread has only 20 threads per inch).
(Major diameter is 0.4364”) The fittings on the end of the tubing therefore are not NPT threads.

Not familiar with the fuel lines on a carrier but if it is 1/4" tubing the above sizes would be correct.

Hope this may be of some help.

Cheers,

[Lynn Eades]

Jacques, that is a little gem of a piece of info. On behalf of many of us, I say "Thank you" Sir.

[Jacques Reed]

Thanks Lynn, Always glad to contribute to the knowledge base.

As a matter of interest I was pretty certain they were NPT threads on the fitting and not BSP as the origin of the vehicle was North America. I thought I better check anyway as Canada being a Commonwealth country they could be BSP. We all know how many different thread forms are sometimes used on our MV's.

I tried measuring against a 1/8 BSP tap but that was inconclusive as I could only engage about 3 thread due to the first three engagement threads of the tap being reduced height. I then set my Vernier to 5/27" (0.185") NPT size and compared the five threads against it as per photo. Again, inconclusive as 5 BSP threads would be a distance of 0.179". My old eyes cannot distinguish 0.006" difference on an old fitting.

I then remembered the major diameters are different and measured the fitting. Sure enough, the fitting is 0.403 diameter at midpoint of the threads.
I put the Vernier across the BSP tap and it passed through with out even getting close to the sides as the major diameter of 1/8 BSP is 0.383"

Always more than one way to figure something out.

Hope this is of some interest.

[RichardT10829]

Where the valve mounts the the hull, on my example I noted a bracket which I took to be for a spring ? Does anyone have information on how that spring was fitted ?

[Robert Bergeron]

Thank you Jacques and sorry for the delay . I was side tracked by an unexpected piece of legislation in Canada .... Nice job . I will try it out and post . Richard , a picture would help . Cheers.

[Robert Bergeron]

Jacques : 1/8 NPT fittings work fantastic ! Thanks . Richard : Are you talking about the spring that helps the selector valve open and close with the very long actuating arm ?