I just installed a brand spanking new Holley Black series fuel pump and 4-9 psi regulator also made by holley. Ive had the same setup previously, but the pump started leaking so I got a new pump under warrantee and got the regulator for the hell of it. Ordered a normal cast one and in the box was a nice new chrome one :cool: So i made out on that. But I seem to have a problem keeping the fuel pressure above 6 pounds. Especially if I drive a long ways, almost like vapor lock, but doesnt completely lock. If I drive for ~40mins to the track, the pressure will drop down to around 3 pounds. Also if I hit the throttle while watching the gauge, it drops down a 1/2 pound, but doesnt make sense to me since its an electric pump and should run a constant pressure.
I dont know whether it is because of the hot weather in addition to the non-coated headers, or if its something wrong with the pump or regulator setup. I have one side of regulator outlet with the gauge and fuel line to the carb, with the other going to the return line with a 3/8 NPT x 1/8 NPT reducer to keep the pressure up towards the carb, but have a 3/8 hose on that 1/8 NPT cause it was a stainless braided line I had laying around, but didnt think it was that cause it still should be hold the pressure back from the reducer?? correct?
anyone have any ideas why this is happening?? I need to get this fixed so I can spray already~! :jester :lol:


[Modified by 74VETTE, 11:28 PM 7/7/2002]

 

what im more or less asking is how can I get more than 6 psi at the carbs and saefty switch?
or is it safe to spray the nos if the fuel solenoid has around 10 psi since the supply is before the regulator, but the carb only has 4-5 psi since its after the regulator and im getting that 4-5psi reading on the gauge?
id rather figure a way to get the pressure up a bit though.
here is a bootleg schematic of my setup

thanks again
Chris


[Modified by 74VETTE, 11:27 PM 7/7/2002]


[Modified by 74VETTE, 11:27 PM 7/7/2002]