Corvette Regulator Issue
Thread Starter
Teching In
Joined: Jun 2018
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Corvette Regulator Issue Hi I'm having a weird issue with my corvette regulator. Some info on my build is supercharged LQ9, Walbro 450 with -8 feed and -6 return, Sniper rails, 1000cc (88lb/hr?) injectors. When I have the truck running my regulator is jumping around +/- 5psi and it also wont change the pressure when adjusting the screw. However, it will regulate pressure just fine when I run the fuel pump by itself without the engine running. Stays dead nuts on whatever I set it at. What could be causing this reaction because of the engine running? This is not boost referenced. I was trying to set up boost reference when I noticed the issue.
TECH Fanatic
Joined: Jun 2003
Posts: 1,869
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A scientific principle is that when you increase pressure you reduce volume. So to increase volume the FPR allows the increase in volume while at the same time maintaining a static pressure on the outlet side of fuel injector.
If by chance you are using both together then you need to remove the Corvette filter and instead install a larger (volume capacity) than the stock fuel filter and let the FPR maintain pressure and volume.
https://www.turbosmart.com/news/how-does-an-fpr-work/
Some older model year trucks do have a fuel pressure regulator. Is yours one of them?
Last edited by dlandsvZ28; Apr 20, 2020 at 07:41 AM.
