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You’re certainly not the first person to report success with the vented cap. I wonder why the aftermarket companies don’t simply offer that as the baseline solution. Vented caps are readily available and it’s certainly a simpler installation. 🤔
Last edited by TKX 5-SPEED C3; Jan 29, 2025 at 03:30 PM.
So, vent discussion aside, I adjusted the float rod on my new fuel sender and ran it through its paces with the Fluke meter. Same number of ohms at full sweep, but it seemed backwards at first because I forgot that the original float mounts from the bottom and the new float mounts from the top. I want to say it was 0-60 or 0-90 ohms. I forget now. 🤔
I also rotated the float rod by 90° so that it bisected the float ball instead of being at the bottom of it. I can’t decide if that gives me more or less margin at “E” - maybe neither. 🤔
I bought mine directly from tanks.com... I just got a vented cap the whole setup was about $600 thru them this summer.. I'm using with an aces killshot system. Still installing the new engine then the efi
0 - 90 Ohms.
myself, home made baffle made from a bread loaf pan I purchased from a Op Shop. (Second hand store).
never a problem with a low fuel tank. My return line dumps into my home made baffle and never once in about 5 years now have I ever had a starvation issue.
Now mind you this fuel baffle did set me back about 1 dollar.
Not real clear on the price of a Holley hydra matt. But I'm thinking it might be more than a buck.
The HolleyHydra Mat is not cheap at all. The piece that came with my HolleySniper's OEM Fuel Module would normally cost $220 by itself. It is a great product that really works well at sucking only fuel thru the hydra mat. It will pull fuel in with a absolute minimum of gasoline anywhere near the hydra-mat.
"Perfect for vehicles experiencing fuel starvation during hard cornering, acceleration, stopping, inclines, and low fuel conditions"
While installing the hydra mat, I placed it on the floor of the tank near the rear. From here it never had any issues with sloshing around and stalling the engine due to low fuel pressure. Using the gas tank fill opening I was able to reach an arm into the tank and push the hydra mat where I believed it would be most valuable and work the best for me.
If I did have any air being sucked in then I would likely buy a bigger piece of Hydra Mat and that would likely solve that issue. It is a shame that Holley charges so bloomin much for the Hydra mat! I suspect more and more racers will be using this material just because it really works. If I put a BIGHolley sticker on my car maybe they will give me a better price for a chunk of hydra mat. I would use it in every car I own because it does make a difference!
I'm running the hydra mat- works great!!!
Originally went with the stealth Aeromotive system- but the sponge started dissolving!
Used a gas cap I never have to remove and loose!
Did some test fitting of the tank over the weekend. Wrestling it into place by myself was a little bit of a challenge, so I used a combination of lifts to get it into place and a 2x4 to support it while installing the bottom brace. The new straps are a real pain in the butt, but I’ll get them sorted soon enough.
For my EFI system I simply used the original factory fuel tank as it was in good shape both inside and out. Then when I ordered the EFI system I also bought the Holley OEM Style In-tank fuel pump module and pressure regulator which were so simple to install. I removed the old parts and installed the new parts in way less than an hour. They even give you a piece of Holley's wonder product Hydra-Mat which helps draw in gasoline from extremes.
I drained the fuel tank out by siphoning out the fuel. Then I pulled the plug out of the bottom of the tank and installed the new in-tank fuel pump and regulator and replaced the plug. Then the wiring took a few minutes and I had 58 psi at the throttle body like it was supposed to. I had budgeted $2500 and ended up only spending less than $1700 for everything including the entire fuel system.
The salesman at EFISYSTEMPRO.com and they were trying to find ways for me to get the most without buying things I didn't or wouldn't "need". I was prepared to buy an EFI fuel tank but after seeing and using the OEM Module I am very glad I kept that money in my pocket. The sales people were actually trying to help me get what I needed, versus what they would like to sell you. The guys at EfiSytemPro also give you 24 months of Post Sale Support to ensure that you are happy with your running system. They also keep the parts in stock and have awesome service for anything Holley provided that you bought it from them. With these guys you don't have to call Holley's tech support because they employ a Holley Tier 3 Expert on their staff and he is incredibly useful and knowledgeable in anything EFI.
EFISYSTEMPRO is the one stop shop for qualityHolleyEFI systems and I strongly recommend them to any Corvette owner.
That's the way I went. I left the charcoal canister and original roll over valve in place on my 1971.
Got the tank permanently mounted tonight. I spent way too long wrestling with the aftermarket tank straps before I went back to the originals. A little clean up and some fresh paint and they were good as new. The new plastic shield on the back side of the tank was a bit of a challenge, but I got it done.
I ran Earl’s Vapor Guard EFI hose and AN style connectors.
After I tightened everything down, I lowered the car on the lift so that I could check the gas cap alignment against the access door. I was off by half an inch, so I went back and loosened everything all over again to make adjustments. I’d recommend checking BEFORE you tighten the straps. 😜
