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#1
09-16-2025, 01:47 PM
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Fuel pump recommendation
I installed the rebuilt original engine in my Z28. Immediately the fuel pump had fuel pouring out of the vent hole. I installed a brand new from Napa and had flooding issues. Installed a fuel pressure gauge and 12.5psi.
I am looking for a replacement now and any recommendations would be appreciated. Anyone have experience using a Carter M4685 Anyone have a Delco replacement Anyone have an original 40669 rebuildable core. Thanks in advance!
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Steve Shauger The Supercar Registry www.yenko.net or www.thesupercarregistry.com Vintage Certification™ , Providing Recognition to Unrestored Muscle Cars. Website: www.vintagecertification.com 
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#2
09-16-2025, 04:01 PM
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Just bought this one for my 327, haven't checked the fuel pressure so can't verify that. It seemed to solve the issue of hot starts due to overpowering the needle/seat though. It's the cheapest usable pump out there I think, but I did have to reclock it, and tap the holes, since every other hole has threads. I believe it was an 8mm/24 tap???
Last edited by cheveslakr; 09-16-2025 at 04:03 PM.
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| The Following User Says Thank You to cheveslakr For This Useful Post: | ||
Steve Shauger (09-16-2025) | ||
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#4
Today, 07:20 AM
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I posted on a thread a few years ago about this issue. All of the modern fuel pumps have way too much pressure. I don't know if they all use the same spring from the same manufacturer or what. I went through several trying to find one for the El Camino back in 2017. All were between 10 and 12.5 psi. Ended up getting a low pressure electric.
The only sure fire fix is to use one of the older rebuildable type pumps and purchase a rebuild kit.
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Don't believe everything you read on the internet ... Ben Franklin
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#6
Today, 11:25 AM
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Quote:
https://agrebuilders.com/
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Dave Dykstra 1968 Camaro Palomino Ivory/Ivy Gold interior -Delivered to Courtesy Chevrolet, Los Angeles, CA 2013 Corvette Grand Sport 60th Anniversary Edition Arctic White/Diamond Blue interior -Delivered to Bill Jacobs Chevrolet, Joliet, IL NCRS#66003 Speed dictates the severity of consequence-Tres Martin Dykstra Motorsports
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#7
Today, 12:11 PM
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Quote:
I sent two old 40669 & 40370 to Fred Ballard for rebuilding. Not sure if there is another rebuilder for the crimp bottom type fuel pumps. I could have installed a small regulator but preferred using a GM pump.
__________________
Steve Shauger The Supercar Registry www.yenko.net or www.thesupercarregistry.com Vintage Certification™ , Providing Recognition to Unrestored Muscle Cars. Website: www.vintagecertification.com
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| The Following User Says Thank You to Steve Shauger For This Useful Post: | ||
X66 714 (Today) | ||
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#8
Today, 12:19 PM
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Quote:
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1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO 1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E 1970 'cuda Moulin Rouge, 440-6, 4 speed
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| The Following User Says Thank You to X66 714 For This Useful Post: | ||
dykstra (Today) | ||
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#9
Today, 07:12 PM
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I installed a Carter M4685 two years ago on my 302 and I’ve had no problems. I have not measured fuel pressure, so I’d be curious if anyone else has measured the Carter.
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~Matt '69 Z/28 RS '77 F100 '83 FJ60 '10 WC50 ‘24 J250
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