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MG Midget and Sprite Technical - New Fuel Tank No fuel To Carb

Just fitted a new fuel tank from Moss 7gall which I believe has a Evaporative Emmision Control in the tank. I've also fitted two new Facet competion pumps same as previously used. What I found is that I could not draw fuel from the tank to either pump and the fuel filter in the line from the tank to the pumps was empty. The only way to get fuel up was use air to blow fuel up and them syphon fuel using a tube with suction baloon out of the pumps. Ive had fuel from the pumps after a lot of air coming out of the pumps to a container and up to the carb (45dcoe) but vey little in float chamber fuel flow now stopped again. I used Facet pumps for years supposed to be self prime and always have been.
I think the problem lies with the tank as my old 6 gall had no issues. when doing all of this the fuel cap was off.
Any ideas please?
Peter King

Same tank as you previously posted about or another one?

Two pumps in parallel for redundancy I guess, is one of them sucking back through the other?

1) Can you suck fuel out of the tank manually, i.e. suck cautiously on a long bit of clear pipe?
2) What happens if you just use one pump (disconnect/cap/crimp off the other)?
AdrianR

AdrianR, Bucks, UK
Same tank as you previously posted about or another one?

Two pumps in parallel for redundancy I guess, is one of them sucking back through the other?

1) Can you suck fuel out of the tank manually, i.e. suck cautiously on a long bit of clear pipe?
2) What happens if you just use one pump (disconnect/cap/crimp off the other)?

Both pumps have seperate feed so only one in use at anyone time. Got caught out at the end of a rally when the pump failed now run two
Peter King

AFAIK there's only one outlet on a midget tank so how do you have twos eparate feeds to the two pumps?
David Smith

Thinking the same as you David--if the pumps haven't got check valves, maybe the fuel is just getting pumped straight back through the not operating pump.
Maybe if the supply line to the pumps is a rubber hose ? try pinching off the supply line to the inop pump and see if the working pump then works properly. If that works a pair of little inline check valves will do the job----but make sure they're fuel compatible and not just vac. valves
A pic. of your pump/lines setup would be interesting.

willy
William Revit

This thread was discussed between 22/05/2024 and 10/06/2024

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