Don't use the Holley blue pump, I have one in my car and I am eventually going to remove it.(hopefully sooner than later). The Holley blue pumps are designed to run at 7-14 psi and don't like running lower and will shorten the life of the pump. My regulator will maintain 4.5-5 psi when running but the huge pressure produced at idle can create issues of over fuelling and when the engine is off I have installed a relay that only operates when the engine is running as the pump pushed fuel past the needle valves to the float bowls. These pumps are designed for worked v8's and are way to big for my application and I have twin 45dcoe on a 2.4l. The pump is also extremely noisey, admittedly I don't have the correct rubber isolators at the moment but they have a reputation for it, they also have a reputation for failing when restricting flow.

if I still have it I will put a link up for a short video of my car at heathcote drags. There is a droning noise that is clearly heard through out the video until I launch, that's the pump!

just get one of these instead: http://www.ebay.com.au/itm/131318770921?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Ok so i have a holley blue fuel pump installed which i know standard pumps at about 9psi. But with regulator i should be able to adjust this down. Question is will i be able to get it down as low as the required 3-4 psi? Does anyone know?

Thanks
Trav

Thanks dave. Didnt think of T before but certainly should have as seems pretty damn logical.

Yeah its looking more likely i will just go back to original pump. Will see if i can get this setup running right today first though.

Thanks
Trav

The return line does not need to be in the carburetor. Just T the line before the carb. That's how Nissan did it.

Or better yet, fit a stock fuel pump, as it is the correct pressure and volume for Webers.

Ok so not so easy. It seems the fuel return on the carby hasnt been plugged up but just has no barb and doesnt appear to have a thread to put one in. Does anyone know if they were produced without a return barb from factory?

Thanks
Trav

Nice. Too easy. Return line is there so just got to find a tap for the carby as i bought it already plugged. Thanks for the help.

Trav

Leave it all as is. Don't disconnect the fuel regulator from manifold -it wont rise as there is no boost pressure hence will regulate as normal. Yes you should also have a return as an electric fuel pump will provide excessive pressure for your carb.

Alternative is to remove all and get a mechanical fuel pump.

Thanks go1200!!!

Ok so do i simply remove the hose from the top of the regulator that originally plugged into inlet manifold and turbo to prevent it from rising? Do i need to plug this top tap or just leave it to atmosphere? Also if i am running the same aftermarket electric fuel pump that was on the turbo setup, do i need to connect a fuel return hose from the carby? The blow through setup had a return hose so i assume i will need to keep this in play with this fuel pump?

Thanks
Travis

I think you should keep it on depending on what fuel pump you are running . The blow through setup would have run a pump to keep fuel pressure 3-4 psi above boost pressure hence the rising rate reg. So if your have gone back to NA, i'd say you will have too much pressure and have to regulate it back to 3-4 psi.

The fuel pressure reg will never rise as its not under pressure (boost) or you could go back to a standard pump.

Hope this helps