Procharged94Lt1

Little background first- ran out of fuel last time on dyno so I managed to find a smoking deal on an entire fuel system- way more than I need I'm sure, but at least I'll be ready should I need to upgrade someday.

-12AN line feeding a Weldon 2015- has AFPR up front along with a dial-a-flow that I have hooked up. Fuel is feed up front via -10AN line which splits into -8AN into each fuel rail, then to AFPR and -8AN back to the tank.

My problem(s) are the following- I don't think the dial-a-flow is working. I didn't notice any difference in the fuel pump noise. Also, the switch that is meant to kick the pump to full capacity somehow turned into a kill switch for the entire system. Also- when using the dial-a-flow can you hear the difference in how the pump sounds from dialed back to full power?

Question 1- can someone who has a manual for the Weldon dial-a-flow either email a copy of the instructions to me, or just plain tell me how they have theirs set-up?

Question 2- Why does my fuel pressure drop WAY down when simply cruising down the road?

The fuel pressure doesn't drop at all when driving around in the city, but as soon as I start maintaining a steady speed my fuel drops considerably- like to 20 psi at some points- its set to run at 42. My thinking is either something is causing the fuel to not get picked up by the pump or possibly the sender is somehow screwed up. It is mounted right above the driver header since the AFPR is mounted right next to the brake booster on the inside. Perhaps the heat from the headers is screwing with the reading? The car doesn't run differently when the pressure drops either- floor it and the pressure returns. Would not having it boost referenced have anything to do with it?

Hope this makes a little sense and someone can give me a little direction here...thanks

mzgp5x

I've got a 97ss 383ci D1 procharged with MM6. Specs...
twin Walbro 255 lph pumps. Pump #2 is switchable OFF.
Pump #1 has a KB BAP voltage increase mod.
I run both pumps all the time. Only switch Pump #2 when it sucks air from a low tank level.
(2) -6an lines to a fuel Flex-Lite heat exchanger mid car.
(1) -8an line to a large Aero_M fuel filter then to Rt side rail.
A series circuit (I know, it is'nt the best, but, it is working OK).
Modified fuel rails with a Aero regulator up front (not on end of rail).
Use a boost ref pressure line.
-6an tank return line.
Fuel pressure is set @ 46psi, and will spike to ~50psi+. Never goes below 46psi.
I have an Auto-Meter fuel press gage with an isolator. I have had problems with heat, so, I ran the line clear of the heat source routed thru the left fender well into the passenger compartment.
I have no fuel delivery problems @ ~14/ 15psi. HTH. B.