When I installed my piston-lift-pump, I ditched the hard-line, between the lift-pump and filter-head, in favor of flexible fuel line. (Thank goodness I had the foresight to do so. It makes lift-pump work a breeze.)

At the lift-pump end, the original factory hard-line has what looks to be a compression fitting.

The threads are the same as 1/4 N.P.T.

The problem is that N.P.T. threads have a gradual taper, whereas the compression threads are straight, and have no taper.

I managed to farm-boy around this difference, but would rather have things right.

Where can I get an adapter to put a #6-AN male fitting in that compression fitting hole??

How have others addressed this situation, when changing over to flexible lines??

Thanks.

 

I haven't gotten to this yet, but I planned to just take the lift pump into my hydraulic fitting/bearing shop and have them fix me up. I think it's a reverse flare type fitting or something. The only problem I could see would be if they had to make a fitting out of two. One would be a reverse flared to pipe in the lift pump, then a pipe to AN. This could hit the tappet cover.

 

Today, I went to the closest thing we have to a hydraulic shop = NAPA.

I didn't have my old pump with me for fit/check; but, with the big cabinet full of various styles of fittings, I think I have a plan that will accomplish the job in three fittings and a length of tubing bent at 90*.

The tubing sticks down in the top outlet of the lift-pump, just like the factory hard-line.

The 90* bend makes it able to point in the best direction for clearance, before tightening the compression-nut.

Then, a compression to NPT adapter gets compressed to the other end of the tube.

Then, a male #6-AN X NPT adapter screws into that.

Would it be more secure to trade the fitting described in red for a flared fitting, and flare that end of the line??

It would be ideal if someone were to simply make a #6-AN X ?size? Compression adapter, that would do this job in ONE fitting.

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I successfully accomplished the job with only one fitting; but, I almost decided I never was going to get it not to leak.

What I have on it at present is a 1/4 NPT brass elbow X 3/8 fuel-hose fitting.

The 1/4 NPT threads easily into the hole; but, the hole is straight walled, whereas NPT threads taper.

I doped the threads with sealant and tightened the fitting to the point of near breakage, before I got the drips to stop.

 

I'll go to my local shop this Friday and report back to ya.

 

A compression fitting will be just fine. There's not a lot of pressure involved there.

 

My local shop had what I needed, it's a 14mm metric inlet. It's 14mm x -6an/jic straight coupler. Similar to the straight coupler you'd use to eliminate the hard fuel line to the inlet of the VE, only that is 12mm. Has an o-ring and some type of flat washer.