When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Heres what I got:
97-98 Corvette rails,
Dual 255 intank
oem regulator has been removed from bucket
Hyperfuel regulator pn#44120, *adjustment screw backed way out
stock 28lb injectors (for now)
Stock feed line
6an Return off the rails into Stock Evap that connects to the OEM return line that goes to the the tank
Gauge shows 82psi at idle.
Where do I start?
Last edited by 30th t/a; Sep 18, 2019 at 02:03 PM.
the regulator is on the rails witch i still see is in place. It's the thing with the small vac nipple sticking out
I didn't know that was a regulator...i thought it was a pulse damper. I just read that 97-98 rails had a regulator there, so I'll remove it and put a stock pulse damper in.
Thanks
I removed the FPR that was in the rails and installed a OEM pulse damper. Now my pressure is 65psi at idle. It wont go any lower.
*I do not have a hobbs switch. Both pumps are running at the same time. I might ad a hobbs switch later on but for now, is this Okay?
Last edited by 30th t/a; Sep 19, 2019 at 06:13 AM.
I would bet that with both pumps steady running, there simply isn't any way to flow that much back to tank, as-is.
I just swapped out my dual 255 pump setup for dual 340's, and mistakenly had the intank regulator, AND the Aeromotive regulator both in the flow path. I couldn't get it below 62-63psi with just ONE pump, and it'd spike to near 70 with BOTH pumps ON...
Now, with single regulator, and single 340 pump, I can lower fuel pressure to 40 if I wanted to...but it is now set steady at 60. With 2nd pump jumped out to turn on, so I can see what happens, it only spikes to maybe 63, and that's it...
I'd disconnect 2nd pump, and see what happens to the pressure.
or...if that doesn't "fix" it...
The regulator itself may simply not flow enough return fuel
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.
7 Most Reliable High-Performance Engines GM Has Ever Built
Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
80psi at Idle? What do I do? 
