Friday, November 25, 2005
Drill and tap
I also made a fitting for the Ford fuel pump. Instead of a pipe thread, the inlet uses a 3/8"-24 bolt thread. Ford dealers won't sell the fitting that screws in there apart from a $200 fuel line. So I went to the local Ace Hardware and got a short bolt and a 1/4" NPT pipe cap. I drilled out the end of the cap and tapped it for the same 3/8"-24 thread. Then I drilled through the center of the bolt, cut the end off, and threaded it into the the drilled and tapped hole. I then soldered the bolt in place to ensure it won't leak. Voila, a fitting with a 3/8"-24 male bolt thread on one end and a 1/4" NPT female thread on the other. I'll have to see if this seals OK with teflon tape. In retrospect, another possibility might be to take a 1/8" NPT pipe nipple and cut threads on the outside.
Update: I've also found that the 3/8"-24 thread is the same as the thread used on -3 AN flares. So if I could find a -3 to -6 flare to flare reducer, that might also work.
Another update: For those who found this entry by a search engine, do not try making this fuel pump fitting at home. The threads do not seal. Use the AN fitting instead.