I have just installed some tripple 40mm Dellorto's and have a problem with the leaking of fuel out of the ram tubes. My undertstanding is that this is caused by too much fuel pressure pushing the fuel past the seat. (The seats are 1.5 size)

I have Holley Red fuel pump mounted at the fuel tank and a Speco Fuel Regulator which is mounted just in front of the rocker cover on an L28 motor.

However, to get enough pressure to the third carby, I need to push the regulator up to 5psi which causes the first 2 carbys to flood. If I turn the fuel regulator down to 3psi the carbys stop leaking but the thrid carby does not get any fuel.

I have changed the hoses around to try and get more pressure to the rear carby but without result.

Not sure if this is the problem but would welcome any ideas, e.g. setting up a fuel rail, multiple fuel lines?

Has anyone else encountered this issue?

Thanks for your help in advance

Biker

Any hints anyone??

Check your float levels.

Sounds like too much restriction in the fuel lines between the carbs. Do you have a fuel rail? Or are you daisy-chaining them?

Check your float levels.

Checked the float levels and they are okay and in spec.

I was daisy chaining but have now redeployed the standard fuel rail line from the SU and coupling one and three to the centre carby. this did not solve the problem either. It is only the first carby that leaks. Will play around with the floats again.

Thanks guys - still welcome any further suggesstions.

Biker

I am having the same problem. Do you or should you have a return line? and will this help?

I am having the same problem. Do you or should you have a return line? and will this help?

I got the old 2 outlet fuel line for the SU's back on and am using the return line incorporated in that. did not solve it though. I have noticed that the rear carby will not get any fuel unless the regulator is turned up to 5psi. Under this pressure, there is no fuel coming out of the hose from the fuel line even when the fuel pump is whirring away.