I just recently did the 1/2" Draw Straw II Install and have it set per directions that came with it. I have a almost 2 yr old Holley Blue as my Pusher. When I first did the DSII install(1 week ago) my pressure was 18-20psi idle and 14 psi cruising on the highway. Tonight(maybe 50miles on the install) on my way home for a side job, I had the crusie set at 62mph and Watch the fuel pressure gauge jump from 14psi to 8psi back and forth and randomly. I checked the Electric FP Gauge with the Mechincal FP Gauge I have and its acturate.

I have a Full Tank, so it isnt sloshing around to loose prime. I was going to hook back up my stock line and see if the pressure jumps still. Do I just have Too Big of a Line for my Holley? Is she wearing out? Has anyone else ran into these problems?

I'd hate to take out a VP44 due to a $30 DrawStraw that was too big for my set up.

Thoughts? Opinions?

Thanks!
Rick

 

my guess is you have an airleak. and to add there is no such thing as too big on fuel lines

 

ZERO Air Leaks or Fuel Leaks. I just checked the entire system...

I'm now leaning towards a bad pump.

Rick

 

My fuel pressure does that too. Mine bounces between 12 and 9.5 at idle and 8 and 9 during normal driving. My LP is in the stock location and i had it changed when i had my new VP installed @ 58000 (68000 now) miles and pressure has bounced since new. I havent figured mine out yet either.

 

I found the brass screen in the Holley Fuel Pump clogged.

Later,
Rick