I had a similar problem a few years ago.
Car ran just like that.
Problem was a valve in the fuel pump came loose.
Worth a look.
Al
www.triumphowners.com/625
---- robert fabie <bobfabie@gmail.com> wrote:
> Hello List:
> These facts I know to be true: Visually and according to the gauge, there
> was just under 1/4 tank of gas in the tank. The filter is not clogged. The
> gas tank was rebuilt two years ago and it is not believed to be clogged.
>
> Recently, my engine began sputtering and surging as if running out of gas,
> then sputtering and finally dying. I pulled to the side of the road for a a
> couple of minutes. I noticed the fuel filter was empty. When I levered the
> primer on the fuel pump, it didn't feel as if there was any suction and no
> gas was making it to the filter. After a few minutes, gas appeared in the
> filter and the car started and ran for a while before again sputtering to a
> halt. Believing that it might be a venting problem, I flipped open the gas
> tank cap and thereafter, noticed fuel filling in the filter. The car drove
> normally for a few miles and then sputtered again. I topped off the gas tank
> and then drove 40 miles without another sputter.
>
> There is a vent hose that runs from the top of the gas tank (on a '75)
> through a canister/seperator and then to the engine compartment and into the
> carbon canister. Running low pressure air into the canister revealed no
> restrictions. Trying to run air from the carbon canister side of the vent
> line back to the gas tank met with restriction.
>
> Questions:
> Does the canister/separator at the gas tank only vent in one direction,
> i.e., toward the carbon canister in the front? If so, that would explain why
> there was resistance to the air pressure I was blowing from the carbon
> canister. If the canister/separator is not a one way vent, then it appears
> to be clogged. This part is NLA, but does anyone know of a similar
> replacement? Any other ideas?
>
> Many thanks,
> Bob Fabie
> '75 TR6
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