Quote:
Originally Posted by rodneym
Thanks for the suggestions 
Undy, the Holley Red has an internal regulator and the black doesn't?
I couldn't find anything online about this?
Why would pressure creep suddenly happen? |
You'll notice the note in description "no regulator required" which means it has an internal regulator. That regulator acts like a separate return line, as it returns fuel directly back to the suction side of the pump which is integral in the pump's housing.
Holley Performance Products 97 GPH “RED” Electric Fuel Pump*12-801-1
Here you'll see that the pump puts out 14 PSI and it states "regulator required"
Holley Performance Products 140 GPH "Black" Electric Fuel Pump*12-815-1
With a single line system on the black pump you won't get the fuel return like you get on the internally regulated red pump. What you do get is the constant hammering on the regulator, which over time allows the fuel pressure to inch up. At idle the fuel flow in minimal which makes the hammering and fuel creep worse. My single pipe system also worked OK for a period of time too, like yours. I then started to notice carb flooding and hot start problems. The slowly increasing pressure started to overpower my Holley float needle valves and dribble fuel out the bowl vents.
If you don't really need all the GPM that the Black pump provides I'd switch to the red pump. That would be cheaper and easier than running a new return line to your tank. I really believe that would fix your problems.