Jenvey throttle bodies on an Alfa V6 24V photos.

[Strat Fan]

A dash 10 balance pipe across the bottom with a dash 6 vent pipe at the top should be absolutely fine for levelling the fuel side to side, a dash 12 at the bottom maximum.
There shouldn't be any issue with fuel starvation when running with a swirl pot in the system.

Chris,
With 2 LP pumps feeding the swirl pot I assume you have an adequate return back to the main tanks to avoid any issues at the swirl pot itself?
Does your regulator return feed back to the swirl pot or back to the main tanks?

[ChrisC]

A dash 10 balance pipe across the bottom with a dash 6 vent pipe at the top should be absolutely fine for levelling the fuel side to side, a dash 12 at the bottom maximum.
There shouldn't be any issue with fuel starvation when running with a swirl pot in the system.

Chris,
With 2 LP pumps feeding the swirl pot I assume you have an adequate return back to the main tanks to avoid any issues at the swirl pot itself?
Does your regulator return feed back to the swirl pot or back to the main tanks?

Returns back to the main tanks Craig.

[Guy Mayers]

Balance pipe - my Hawk tanks came with an outlet on the bottom that was the same diameter as the breather pipes in the top of the tank. I resulted in a very embarrassing situation at the MOT station where the fuel was returned to one tank but because the pick up was off a T in the balance pipe it wouldn't flow back to refill one side. Soon resulted in an overflow. oops.

All history now but the balance pipe was replaced with a 15mm OD pipe and, with the Alfa 164 pump in the tank and the return line to the bottom of the swirl poy I've had no fuelling issues since. Ignoring braided line failure due to rotted rubber that you can't see.......

Chris, glad to hear that the photographed installation wasn't the final one. That gave me a sleepless night I think!

Guy

[tipo158]

There is a lot of great information here, thanks for everyone's input, it gives me more confidence setting up the inductions.

Thanks,
Corky

[jasonlycett]

Hi All , just a quick question on this as i will be going down the same route late with my car. Do you need to fit an aftermarket fuel pump as per the diagrams or would the standard 166 pump be sufficient for a mildly tuned (280bhp ish) throttle bodied engine?

I have a Bosch 044 fitted to my Noble and its a horribly noisy thing always buzzing away, so would prefer to not have one of those right behind me if possible!

[Jeff]

This is a subject which has been discussed before. I believe the basic wisdom is that there's absolutely nothing wrong with the standard pump and it's free! It should also simplify a range of other elements in the engine bay so worth going with unless you have specific objectives that it cannot achieve.

[tipo158]

I was wondering, where do you pull a vacuum for the pressure gauge. Normally it would come from the intake, but I don't see anywhere on these throttle bodies to attach a vacuum line.