petrol pipes Taimar

[phillpot]

My return pipe has a T in it as it enters the petrol tank well, one pipe goes off to a stub about 2" below the filler cap and the other to a connection on top of the tank, I have an alluminium tank (non original?) so this may not be standard?

My question is, do I need this T and the pipe into the filler neck? Wouldn't excess petrol just return into the tank or does this pipe act as some kind of vent or anti-air lock or something?

or if tank were brim full would excess fuel not be able to "push its way" back into tank and fuel pressure would push float down in carburetor (electric fuel pump) but once fuel level drops it's better to have petrol return direct to tank than splashing into the filler neck?

Obviously the stub would need sealing off, there is another, higher up, which must be the vent to allow air into the tank?

Your thoughts, comments or greater knowledge appreciated

[bluezeeland]

original situation was like so;

return line from carb, T piece, one to tank, one to vent (thats what it is) line from T to vent had another T in it, going to (carbon) cannister, line back to inlet manifold (sort of medieval EGR device)
twin inlet/oulet on tank is as per original, even on alloy tanks

me topence

[phillpot]

Carbon canister long gone (if ever had one) so guess I'll just put it back as it was with some new pipe and clips, "if it ain't broke don't fix it"

Thanks.

[dryden]

Hi Mike, I fitted a new alloy tank to my Taimar, and have just had a look at how I connected it. There are two small dia. pipes feeding the return, and breather, on the off side. as you look at them, the right hand pipe fits on the T spur, and the left hand of the two fits the straight side of the T. The overflow pipe on the filler neck is retuned through the floor. It seems to work .

[whitewolf]

Mine ( as pre and post strip down) was purely carb return to top of tank.

Near the return on the tank is another outlet that has a pop to one side of the filler neck.

Second hole on the filler neck goes to boot floor through a small hole that vents.





Weather right or wrong I'm not 100% but that's how I got it..

[oldgeebee]

Here's a photo of my '79 3000S before strip down in original condition.



There's no carbon filter or re-return. The carb overflow comes back to the T piece joining it to the tank and the tube coming down from the vent pipe on the right of the filler cap. The tube on the left of the filler cap drains through the floor of the boot. Inside the filler cap, the drain is slightly higher than the vent.
Seems to tie in with most of the above apart from Bluezeeland's carbon filter malarky.

GB

[jastx]

My '77 2500M (US) has the fuel system shown on the bottom diagram with vapour separator.

See: http://www.olenik.com/tvr/catalog.pl?page=2.10

[phillpot]

Thanks everyone, Graham's photo looks near as damn it like wot I've got so that's how we'll leave it