custom fuel line/return line routing

[potopaj]

I'm getting a high flow electric fuel pump for my dual quad riv.

I'm gonna set pressure at the carbs at 4.5 lbs to start with.

the question I have is the best way to route the return line. I can route it back before, at, or after the regulator. The one after the regulator would be after the pressure gauge so I don't know if that would mess things up at the carb.

Any thoughts on which is best?

[DualQuad55]

Jason,

If you are going to run a return line, I would run it at the regulator, but I don't see why you would run a return line if you have a good pump and regulator. I have been running a Holley "Blue" pump for about 8 years and so long as it runs through the regulator, it gives no problems. I would check with the pump manufacturer before spending the time/effort to install return lines.

I run my pump at about 6.5 pounds at idle. I also had a difficult time getting my carbs to idle with the little cam I run. I ended up installing an idle speed adjusting screw like most other AFB's have to set my throttle blades.

good luck with your dilemma.

[mltdwn12]

Jason, I'd have to agree with DQ55. I've been running Holley electric pumps (red, blue & black) on my boat. It has a blown 509 Chebby (gasp). Sorry. Anyway If I run the Holley blue or black I have to run a return line to the tanks only because of the extra heat in the boats engine compartment and the extended idle time. When I run it off idle, I have no problems, but idle through the channel at Havasu for 30 minutes and it heats up and quits. Let it cool and it's back in business. I can run a Holley red pump which isn't as powerful and it never dies regardless of idle. But it won't maintain good pressure during a 100 mph lake run :pp I ran a Holley blue for years on my old GS set up with no problems.

Craig

[grant455gs]

First of all, what kind of pump/regulator are you running?