how to run fuel lines with su's

toughy V8 · Post by **toughy V8** » Fri Feb 09, 2007 1:13 pm

because my edelbrock runs crap ive had to use su's instead just to get me going. now when i first piped them up i blocked off the return and fuel just kept gushing out of the over flow pipes and it made no difference adjusting my regulator. so i plumbed the return in and the overflow has stopped but now when i floor it the car just dies on me then picks up again when i back off, it runs fine when i take it easy. any ideas where i am going wrong

Post by **Coops** » Fri Feb 09, 2007 1:16 pm

what pressure you running at? as i think SU's only need about 3-4psi
if the fuel is coming out of the over flows sounds like the floats or needle valve maybe stuck or the fuel pressure is too high.

where have you plumbed the over flows into?

toughy V8 · Post by **toughy V8** » Fri Feb 09, 2007 1:21 pm

the over flows just vent out of the standard pipes on to the ground, i have no idea what pressure im running at

Post by **Coops** » Fri Feb 09, 2007 1:38 pm

thats the correct place for the over flows,
i think you need to check your pressure with a gauge of some sort, then if you need to raise the pressure and the fuel leaks from the overflows again the carbs will need a strip down and check the float levels and needle valve,

kiwicar · Post by **kiwicar** » Fri Feb 09, 2007 2:06 pm

Hi
have the floats sprung a leak and filled with fuel? used to be a common fault on the 1 1/4s on my old mini.
Mike

toughy V8 · Post by **toughy V8** » Fri Feb 09, 2007 2:45 pm

one carb did until i fitted the return line