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Your cart is empty.Single inner valve springs from COMP Cams allow you to build the perfect spring assembly for your application. The valve spring creation process is far more involved than most people realize. The result is a product that meets and exceeds the expectations of engine builders and racers.
Johnny B. Good
Reviewed in the United States on February 8, 2025
Using it in my pump right now, working well.
tryduck
Reviewed in the United States on September 26, 2024
This was a upgrade spring Comp 973-1 for a 8.3L brand new OEM Cummins Lift pump. After installing it did not produce anymore pressure then a Standard spring that came in new lift pump. Got 10psi idle (650-700rpm) and almost 18-20psi at 1800rpm. Just kept spring in as it was just a waste time to remove and ship it back.It did at least produced standard fuel pressure. Would like to have had the 25-50psi but just did not get past 20psi at WOT on 6cta8.3L Cummins.
Josh C
Reviewed in the United States on March 19, 2024
Worked great in my 12 valve fuel lift pump. Cheap and easy upgrade!
Trevor
Reviewed in the United States on June 21, 2023
Spring worked perfect in my new lift pump.
Chuck
Reviewed in the United States on September 27, 2022
These have gone up so much it's just not what is needed to hot rod your lift pump. Get your pump first,now the plungers in the pumps will not work with this spring. 30 mil plungers are made with smaller ID spring will not work.
Andrew
Reviewed in the United States on March 27, 2022
I replaced my 12 valve Cummins lift pump spring with this one and it bumped me up to 40-45psi of fuel pressure under load. Worked great for my purpose
Evan Guyant
Reviewed in the United States on April 14, 2022
For the last few months I have been fighting a fueling issue with my 12v cummins. I'd have good pressure at idle and cruising, but any load or demand I'd drop below 20psi. I changed fuel filters, changed my overflow valve and was on the verge of buying a new hot rod pump. Looked up the hot rod mod for the lift pump. Ordered this single valve spring and did the swap. Added 2 shims when I put spring in and reassembled. Holy baby Jesus I got fuel pressure back. I'm idling at 30 psi and cruising at 46. And when I decide to hammer the throttle wide open I don't have a drop in pressure. Overall well worth the money and time installing this. Happy I didn't sink another $500 on a new hot rod pump.
Customer
Reviewed in the United States on September 11, 2021
Exactly as described. Nice product. Packaged in bag.
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