fuel return

THE BULL

Wouldnt a 2 liter surge tank with a 6-8 AN hose that feeds the rails help with volume and pressure?

As the engine demands more volume, wouldn't then this volume be satisfied being that there is already 2 liter of pressurized fuel in the surge that can be refilled by the pump once WOT even has ended?

phunk

A surge tank with its own fuel pump(s) providing the rails with pressure reduces or eliminates fuel slosh starvation. If you were to also run a larger fuel line from the surge tank to the rails, you could reduce the pressure drop between the surge tank and the rails. You do need to regulate the new system though, and you do need to devise a technique to keep the original in-tank venturi system operational, since plumbing the stock fuel pump module to fill a surge canister would relieve the original sending unit from pressure thus eliminating the backpressure required to keep the venturis working. If you are adding a new fuel line from the surge tank to the rails anyway, seems like youd be best off to just put the new regulator in the engine bay as you will now have 2 fuel lines and thus can also have a return system, killing 2 birds with one stone. There are ways to make surge canisters work in vehicles with backpressure venturis, but it is a little overcomplicated and that can make it finicky and depend on installation conditions that can become a hassle in certain applications. This is why, for our product line, we eventually strayed away from this overly complex arrangement. We ended up solving all the fuel slosh starvation issues directly at the primary fuel sending unit in the fuel tank, with no secondary fuel system required. We do still call it a surge tank, but it actually just replaces the original fuel sending unit and the entire venturi system. We did the separate surge canister thing for like 10 years, and while it works for the majority of customers, it also painted some of them into a corner when they needed to make custom changes.

To answer your question in short: Yes, a surge tank with a big feed line to the rails can solve issues. But unfortunately the integration is more complex than it sounds and can be finicky with the backpressure side venturi system the Z uses. I wouldnt generally recommend this route to someone unless they have a strong understanding of fuel system dynamics so that they know what they are up against and how to sort out the less obvious issues when encountered. But sure, if you set it up right and dial it in, it could very possibly handle your needs.

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avioni

questions.

does the external regulator on a return system go before or after the fuel rail? if after then how is that installed with oem fuel rails? if before how does it work?

is the fuel dampener connected to the rubber hose that goes to the firewall needed? i have an issue where the dampener line hits the throttle cause of stillen plenum and i bent the line down and it kinked a bit. solution would be to install a plate with AN fitting replacing the dampener and a line to the firewall. but 2 reasons why i havent done it. dont know if the dampener is required and cant find anyone selling a line that would clip to the firewall line and have an AN fitting on the other end.