corvette filter regulator plumbing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lofly'a · 09-28-2022, 09:01 PM

for the gurus which one of the connections is the supply and which is return. i've done many searches and see both as supply and return. i assumed the side (off center) port is the supply but now not sure. HELP!!!!?

LS short box · 09-28-2022, 09:24 PM

The "in" pressure side is on the same end of the FPR as the return. The "in" is the larger of the two and offset from the center line of the return. To the engine is on the opposite side of the FFR.

**mongocanfly** · 09-29-2022, 10:59 AM

Already covered ,but just in case

**Accelo** · 10-09-2022, 11:12 PM

I plumbed my corvette filter regulator just like it said on the internet. Truck had no fuel pressure but I could hear fuel returning to the tank. Looked up the plumbing again and found both plumbing options listed as correct. Swapped my lines around and I had fuel pressure. Everyone has an opinion and only half are correct.
I also had a aftermarket fuel pump that was wired backwards from the factory. It sucked!
After repaing these two items my LS1 still wouldn't fire. Turned out my brand new coil to main harness connectors were wired backwards. (from Fleabay)
Years ago one never had to worry about this type of stuff.
Cheers.

LS short box · 10-10-2022, 04:46 PM

Glad you got it figured out.
So cool when they just fire up.

09-28-2022, 09:01 PM	#1
lofly'a Registered User Join Date: May 2000 Location: Alexandria, LA 71301 Posts: 1,451	corvette filter regulator plumbing for the gurus which one of the connections is the supply and which is return. i've done many searches and see both as supply and return. i assumed the side (off center) port is the supply but now not sure. HELP!!!!? __________________ -02 avalanche (daily driver) -66 gto ragtop 389/400 (garage queen, hand-me-down from dad) -72 Tribute Trans Am (6.0LS/T56 6-speed) in progress -2003 YUKON (Wife's) -71 gmc swb fleet (current project, gonna shave everything, bags, stuff w/ 20's, gen III powertrain) -48 3100 SWB - 12/31/23 LONG TERM Project

09-28-2022, 09:24 PM	#2
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 2,136	Re: corvette filter regulator plumbing The "in" pressure side is on the same end of the FPR as the return. The "in" is the larger of the two and offset from the center line of the return. To the engine is on the opposite side of the FFR.

09-29-2022, 10:59 AM	#3
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,673	Re: corvette filter regulator plumbing Already covered ,but just in case Attached Images __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

10-09-2022, 11:12 PM	#4
Accelo Senior Member Join Date: Mar 2015 Location: washington Posts: 2,299	Re: corvette filter regulator plumbing I plumbed my corvette filter regulator just like it said on the internet. Truck had no fuel pressure but I could hear fuel returning to the tank. Looked up the plumbing again and found both plumbing options listed as correct. Swapped my lines around and I had fuel pressure. Everyone has an opinion and only half are correct. I also had a aftermarket fuel pump that was wired backwards from the factory. It sucked! After repaing these two items my LS1 still wouldn't fire. Turned out my brand new coil to main harness connectors were wired backwards. (from Fleabay) Years ago one never had to worry about this type of stuff. Cheers.

10-10-2022, 04:46 PM	#5
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 2,136	Re: corvette filter regulator plumbing Glad you got it figured out. So cool when they just fire up.



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