Lift pump thread size

[va350]

The previous owner cut the steel fuel line between the lift pump and the fuel filter and spliced it together with rubber fuel hose. Since there are no barbs on the steel lines these connections leak. I would like to replace with rubber fuel hose and barbed hose fitting. Does anyone know what size male threads fit in the lift pump? I bought a 3/8 NPT to 3/8 barb but it is a little too big. 1/4 NPT is too small. Also what size threads at the fuel filter?

 

[va350]

Would it be a 6AN Male x 3/8" hose adapter work? Could it be 6AN and not NPT?

 

[typ4]

It is a 3/8 inverted flare on pump. 1/4 npt on filter. They do make inv flare to hose adapters.

 

[typ4]

Inv flare 3/8 is 5/8-18 thread

 

[va350]

Thank you, I would have never figured that out!

 

[icanfixall]

Russ aka typ4 clearly explained this messed up metal fitting factory idea. I never have figured out why they flared the bottom end but used a 3/8 pipe thread and then on the upper end they used the 1/4 inch pipe thread on the brass fitting with the olive in it. Almost like a basket of crap to make something work. Really would like a definition why this simple metal line has so many different fittings and thread sizes.

 

[typ4]

The pump also fits gas engines, hence the inv flare, top has to flex for vibration failure prevention,hence the vibra loc fitting.

 

[icanfixall]

Thanks Russ. What gas engine does this mechanical lift pump fit?

 

[typ4]

MV 404. Iirc