This is a continuation of my posts in the following thread; http://www.aus300zx.com/forum/showthread.php?t=328212 Requirement: Improve fuel pickup from both sides of the 2+0 fuel tank for circuit racing, and increase fuel flow capability for later upgrade to E85. Plan: Install spare factory fuel pump and carrier to drivers side of fuel tank. Twin in tank factory pumps will then feed a surge tank mounted in the spare wheel well. Surge tank will feed the engine via an external fuel pump (haven't decided which pump yet). Engine return will go back to the surge tank. Surge tank will have two returns to the main fuel tank, one for each side of the tank. This is what the factory fuel pump carrier looks like fully assembled. So far this is where I'm up to. I've removed the fuel level sender (won't need it as I don't have a fuel guage). Have also removed the valve on the return for triggering the other side pickup. I've then bent the bracket for the pickup hose and filter to the opposite side. Fits in there perfectly except for one small problem, the 45deg barb connection on the bottom of the pump fouls on the tank. So I need a 90deg one of these; Does anyone know where I might source a 90deg barb fitting for the bottom of the pump? I also need to source a couple of new pickup filters suitable for using with fuel hose, same as factory. Anyone know where I can get these from?
I think you are creating work for yourself for the sake of it. As long as the surge tank is of a size large enough, you don't need anything more in the stock tank than a 480.
Maybe, but a couple of issues. Firstly, the factory scavenging system from the drivers side of the tank doesn't do a great job it seems. I need to be able to run to almost empty to be able to complete a 1 hour race. Second, fuel equals weight. For shorter races and qualifying, I don't want to be carrying any more fuel than I need to. Again comes down to how well the factory scavenging system is able to pickup that last 5 to 10lts of fuel. And I have two perfectly good factory pumps that don't need replacing. For the sake of one little fitting, and some new hose, I don't ever have to worry about not being able to pickup fuel. Third, the return from the engine will go back to the surge tank, not the main fuel tank, so the scavenging won't actually work anyway, as it relies on the return line pressure to draw fuel across to the passenger side.
If you are going to go e85 in future, stock pumps won't do it. And, if you are planning on a 1hr race on e85, you are going to need a bigger tank haha
No shit Sherlock haha The next stage will be a 50lt external tank mounted where the spare wheel well is. And the two factory pumps in the main tank will be plenty for use as lift pumps for E85. I'll only ever be targeting around 450rwhp. Won't be able to afford the tyre bill otherwise
Show me a link to a factory pump that has failed due to E85. Walbro, AEM and others all market pumps now that claim to be 'E85 compatible', and people buy them because the perception they create is that all other pumps are not E85 compatible, which is rubbish lol.
Another way I could do it is run a Y fitting on the pickup on the passenger side pump, and run a hose and sock down to the drivers side feeding directly to the pump.
Another option which would be even simpler, connect a Y or T fitting in the pickup hose feeding the pump, and run this up to the barb fitting above connected to the drivers side of the tank with the hose running across the top of the tank (currently joined to the fuel return barb). Question is would this prime? I'd need to fit a sock on the pipe on the drivers side pickup, and probably a valve to prevent the fuel draining back. Would this work? I'd love to get some feedback from some of the engineers, mechanics on here lol. This would be the simplest option for now, and solves the initial pickup problem. I wouldn't need to upgrade the pump as I don't need to yet, but yes will then probably upgrade to the Walbro 485 pump.
You'd run into an issue with the path of least resistance, it'd only pull fuel when both pickups are submerged, as soon as one draws air the other will stop flowing. Your best bet for a small system is probably a little scavenge pump from drivers side to the pickup.
Yeah wasn't sure on that point, wasn't even sure it'd prime to start with being it needs to lift fuel up and over the tank. Another option is replace the drain plug with a barb fitting for a small external pump feeding the surge tank, but may as well go back to my original idea and use the two factory in tank pumps. Do you see any issues with this idea Fists?
Haha, I though you were taking the piss, as in 'holy hydramat batman' lol. Not sure how that would work though in the 2+0 tank, would still need 2 pickup points as above so I would need two of these? One for either side of the hump?
Yes. One on each side. If you look at their videos or pictures you will see one setup thst should fit our bill nicely. No need for extra tanks and stuff
Two hydramats tee'd off one pump sounds like it might work, you'd probably want to ask if that's a supported set up before buying two of those suckers though. Potential problems with two pumps sort of depend on how low you're going to run it and you'd likely still want the hydramats to really see the benefits, as soon as one pump is blowing dry you've got a pretty short window to get off the track before it burns out anyway. Either dropping the driver's side drain plug to a little scav pump that returns to the PS, just adding a scav pump to the existing crossover tube or dropping both drains and teeing them into an external lift pump sounds good and simple sitting at my computer, would need to double check those plugs still work well with the fuel surging around and will have to worry about ground clearance/debris and heat shielding though, not sure off the top of my head how close you'll be to anything.
Well that idea didn't last long lol. I just ordered 2x Hydramat 8" x 3" from VPW in Vic, got an extra $20 off through eBay by paying through Paypal Will report back once I've got them installed and tested :zlove: Thanks Kickerzx for the tip
