Fuel tank feed + return union thread type

[Dorian]

Does anyone know what the thread type is for the fuel tank pipe unions?

I'm looking to find a compression fitting with a larger olive which may allow a larger feed pipe than the current solution, required to feed a separate fuel swirl pot for the injection. Previously the feed came from the bottom of the tank which worked, but I'm not entirely comfortable with that for a number of reasons!

Thanks, Dorian

[jbuckl]

The olive is 5/16” id.
Id have to measure the thread … think it’s 7/16" x 20 tpi UNF thread.

Stand corrected if it’s 1/2” according to the sprint reply .

Stag tank does have a sort of swirl pot in it…. The pickup targets that.

This is tr6 but stag is almost identical pot.


swirl.jpg

[new to this]

Ive run 8mm pipe to my Sprint the thread size on the tank i think is 1/2 UNF, i Didnt fit a swirl pot, i fitted a range rover pump inside the fuel tank with a tube inside the tank to act like a swirl pot, i used AN fittings

If you wanted to go bigger size run 10mm pipe, get a bulkhead to copper fitting and then have an adapter made up 10mm to 1/2 unf

Dave

[Dorian]

Thanks for the thread details, I'm really just investigating possible solutions that don't involve too much work to the tank which was internally epoxy (POR) coated a few years ago due to a nasty smelling boot which turned out to be new but porous/sweating fuel hoses. Cutting this would no doubt cause issues with that coating and lead to peeling etc..

Presently I have cavitation problems with a Bosch 044 pump which is fed by a 15mm I.D pipe from 2 x 10mm ID feeds attached to a sump welded on the bottom of the tank, particularly on longer journeys as the fuel warms up.
Previously with the smelly pipes I had a 1.5litre remote swirl pot/tank located inside the rear wing next to the filler which fed the pump on the boot floor with no cavitation, but the lifter pump from the tank to pot was fed from the feeds at the bottom of the tank, not so good in a rear end shunt.
So to put my mind at rest I added two large bore solenoid shut off valves which should isolate the fuel if the worst should happen and got rid of the remote tank, but added complication!

The simplest preferred solution is in tank mounting of the 044 pump, but fitting that into the existing fuel level sender access hole whilst retaining the sender is probably difficult.
Has anyone done this?

Next best would be put the remote tank back and pull fuel from the standard top entry unions in the main tank, but to match the tanks fittings a 10mm OD pipe may be required to supply enough fuel, which is what worked before. This would still need 1 isolation valve and 2 pumps!

So just looking to see how others have dealt with this, ideally in a much simpler way than me!

Apologies for the rambling on.

Dorian

[jbuckl]

Sorry it’s not on topic, but someone here or f.b. was asking about strut braces …. Just noticed Dorian’s strut brace avatar!