Fuel starvation
Discussion
I need a bit of help with my GTM Libra. It has a special fuel tank that has a baffle full width of the tank. This baffle is about 1/4 of the tank and in this section the fuel pump and fuel sender are contained. The fuel return also goes into here at the top. It's on the n/s. My problem is that on long LH fast corners, mainly on track it starves of fuel when it is less than 2 3rds full. I have cleaned it out (there was a lot of rubbish in it) and will change the sock filter. I was also thinking of filling it with foam. I'm not sure if I should do both sides or just one.
Any thoughts, advice?
Fuel tank, baffle is the lh side where it steps down
Baffle
Any thoughts, advice?
Fuel tank, baffle is the lh side where it steps down
Baffle
Edited by rdodger on Saturday 10th May 21:17
Has it got a swirl pot? I used to get this problem on my Westie, although it was fuel injected, the tank didn't have a swirl pot. Got a custom tank made with a swirl pot and haven't had fuel surge since. ALot of people seem to fit an external swirl pot fed by a low pressure pump, with the high pressure pump feeding from the swirl pot to the injectors, but I though the swirl pot in the tank was the better solution.
No swirl pot to speak of. I believe the baffled bit is supposed to act as a swirl pot. The tank was designed by teamgtm club members and alyfab and I am not the only person to have one, but seem to be the only one who has this trouble. It's only on track, perhaps I go round corners too fast?
Well, you already know what the problem is, ie the lower area isn't deep enough to contain enough fuel to keep the fuel pump inlet below the level of the fuel itself in a high G situation.
So, what you need is a cure. Can the tank be modified to make the fuel pump area deeper?
Can the pump inlet be made any lower?
Could you use an external swirl pot?
Could you go around corners slower?
The foam might help, and if it is not too expensive or dificult then it's got to be worth a try. All it will do is slow the movement of the fuel away from the pump, and that might be enough or maybe it won't be.
So, what you need is a cure. Can the tank be modified to make the fuel pump area deeper?
Can the pump inlet be made any lower?
Could you use an external swirl pot?
Could you go around corners slower?
The foam might help, and if it is not too expensive or dificult then it's got to be worth a try. All it will do is slow the movement of the fuel away from the pump, and that might be enough or maybe it won't be.
Thanks for the reply.
The tank was made by allyfab so I guess my first call is to them tomorrow to see if they can, as you say put the return at the bottom and fit an internal swirlpot.
The external swirlpot would be a very tight fit and troublsome to do. Also expensive as I would need an new internal low pressure fuel pump, a new external high pressure pump, swirlpot and of course goodridge stainless hose and jis fittings.
I was thinking foam filling but that would cost something approaching £100 and not guaranteed to work.It would also be a bugger to get out again if I needed to.
Well it looks like it isn't getting sorted this weekend.
The tank was made by allyfab so I guess my first call is to them tomorrow to see if they can, as you say put the return at the bottom and fit an internal swirlpot.
The external swirlpot would be a very tight fit and troublsome to do. Also expensive as I would need an new internal low pressure fuel pump, a new external high pressure pump, swirlpot and of course goodridge stainless hose and jis fittings.
I was thinking foam filling but that would cost something approaching £100 and not guaranteed to work.It would also be a bugger to get out again if I needed to.
Well it looks like it isn't getting sorted this weekend.
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