Fuel starving problem

[Rad334]

Took the striker out today making the most of the nice weather. It seems when around 1/4 full of fuel I seem to get fuel starving on tight left corners, It's not a big problem on the roads but the last time I noticed it was at loton park on a driving school day and the simple fix was to just add more fuel. A chap I spoke to suggested fitting a 'swirl pot' as this fuel starving could damage my pump. My car is blackbird engined and the pump is in the tank so if I fit a swirl pot between this and the engine surely the pump will still get starved. Any suggestions? I'd like to do hillclimbs next year and would prefer to carry as little fuel as possible.

[jeffw]

Carbs or injection?

[RobMsport]

Took the striker out today making the most of the nice weather. It seems when around 1/4 full of fuel I seem to get fuel starving on tight left corners, It's not a big problem on the roads but the last time I noticed it was at loton park on a driving school day and the simple fix was to just add more fuel. A chap I spoke to suggested fitting a 'swirl pot' as this fuel starving could damage my pump. My car is blackbird engined and the pump is in the tank so if I fit a swirl pot between this and the engine surely the pump will still get starved. Any suggestions? I'd like to do hillclimbs next year and would prefer to carry as little fuel as possible.

Either fill it with foam pieces shoved through the filler till totally full or the better way is to fit a 50mm deep 100mm circular minni tank directly under the tank bottom centre ----- but make the hole entry into it say 50mm , then mount the pump directly under that minni tank through a very large exit 12mm ish. Works for me plus using 8mm internal supply/return pipes (they also act as a reserve volume using the one pump)

[adithorp]

Mines the same as Robs. Never have any issue with it.

A full traditional swirl pot setup is just over complicated. The only advantage it has is it dosen't (usually) require modification of the tank.

[Rad334]

Carbs or injection?

It's a 2001 injection engine.

[Rad334]

I'll take some pics of my tank tonight so you can see, but I think it's a mini clubman/van tank that's had an electric pump bolted into the top. Do you think if I made a mini tank under my tank and extended the pick up into it this should do the job?

[RobMsport]

I'll take some pics of my tank tonight so you can see, but I think it's a mini clubman/van tank that's had an electric pump bolted into the top. Do you think if I made a mini tank under my tank and extended the pick up into it this should do the job?

No , I doubt it would be any good , as injection pumps really need to have fuel '' FALL '' into it via gravity (so pump must sit under the ' minni tank ' ) then push fuel up to the injectors. The point with the small hole/50mm leading into the 100mm x 50mm deep tank , is that the fuel cannot slosh away from the gravity exit pipe

[Rad334]

I'll take some pics of my tank tonight so you can see, but I think it's a mini clubman/van tank that's had an electric pump bolted into the top. Do you think if I made a mini tank under my tank and extended the pick up into it this should do the job?

No , I doubt it would be any good , as injection pumps really need to have fuel '' FALL '' into it via gravity (so pump must sit under the ' minni tank ' ) then push fuel up to the injectors. The point with the small hole/50mm leading into the 100mm x 50mm deep tank , is that the fuel cannot slosh away from the gravity exit pipe

Seems you've just made me realise that the pump bolted in the top of my tank should actually be in the bottom.
The pump looks like the original blackbird pump that obviously would never have been on top of the tank on the bike.
Not sure what the previous owner did to the pump pickup to get it to work upside down!
The pump has its own sort of catchment tank built into it so hopefully fitting it in the bottom and blanking the top hole should fix it

[matt_gsxr]

If you pump looks like a GSXR1000 one then you could do something like this.



The disk has some holes tapped in from above and below and it is all sealed with a couple of O-rings.
Has worked fine for the last 3 years. No leaks and no need to weld the tank.

http://www.matt_phoenix.talktalk.net/GS ... dware.html

[adithorp]

I like that but, how did you get to the internal screws, Matt?