Fuel Issues at the Track

[2008 V6]

Didn't find it because I haven’t looked for it yet. Buried at work.
Roadracer - if you want what my unit - no pun intended - PM me your mail to address and you can have it when I find it
Tacked 5" 304SS 16 gauge tube 9.135” prox. tall, top Flat (I think) 14 gauge and btm flat I think 10 gauge (Way too thick but what I had in my scrap bin) contoured for front radius in spare tire well. The spare tire well is not flat so you will have to slightly modify it.
The surge tank will be heavy but when welded will be very solid with little chance of rupture – Decent crush zone behind it. I wasn't sure what size or how I wanted to run the lines for the fuel tank feed and rail return so no holes drilled in 16 gauge cylinder yet. Suggest #6 male AN fitting for all except return to tank #8 (In top center). Stainless fittings are available on line. If anyone wants to copy – be my guest – very marketable – but liability might be a problem for a small business.

 

[jayel579]

http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=9639

 

[SoundGuyDave]

You guys are essentially talking about a swirl-pot, right? Kind of like this?

I agree that it'll take the sag out of the supply issue, but at that point you'll need either a full return-style system, or some way to put a turbine pump on the outlet side of the pot, AND add a constant-pressure pump in the stock tank to feed the swirl pot, AND a return line to shuttle the overflow back to the stock tank. Also, that STILL won't eliminate what I believe to be a pickup issue for fuel in the right-side well of the tank (left-handers).

 

[2008 V6]

You guys are essentially talking about a swirl-pot, right? Kind of like this?

I agree that it'll take the sag out of the supply issue, but at that point you'll need either a full return-style system, or some way to put a turbine pump on the outlet side of the pot, AND add a constant-pressure pump in the stock tank to feed the swirl pot, AND a return line to shuttle the overflow back to the stock tank. Also, that STILL won't eliminate what I believe to be a pickup issue for fuel in the right-side well of the tank (left-handers).

Dave - It is very similar and both work as a band aid. Mine is not a swirl tank, which helps to separate air bubbles. That design might work better. I like that design and might copy it. I didn’t think of that. Mine is 2 chambered.

One fuel line – Constant feed from the pump mounted in fuel tank feeds the surge tank. The stock pump is usually way more than sufficient because of the short fuel line leading to the surge tank and very low line pressure – It will Flow a ton of fuel and could always be upgraded.
A second pump sucking from the center btm of surge tank feeding the fuel rail with a pressure regulator in line after which the un-used fuel returns to the Surge tank.

In a higher G cornering force - situation, usually less fuel is used by the engine but the pick-up in the fuel tank sucks air which causes the pump feeding the surge tank to captivate & suck air until re-primed (Typical vane pump) A fuel / air combo is pumped into the surge tank. The reserve ¾ or more of a gallon (Depends upon size of surge tank) is stile feeding the pump supplying the fuel rail with the excess fuel returning back into the surge tank - Any air - Theoretically - is pushed out of the top of the surge tank though the return line to the gas tank.

This band-aid has been sufficient in my applications to supply the engine when the fuel tank pick-up is sucking air under any high G-Load. The surge tank re-fills very quickly when the fuel tank pick-up is re-primed and supplying fuel to the in fuel tank pump. Air in the surge tank escapes out the top to return to the fuel tank.

Smaller in diameter and taller would be better but space is always a limitation.

First one I made was 5” OD. X 12” tall single chamber – one gallon – Ford Ranchero - bigger boat than my Mustang - all the others were 9” tall ¾ Gallon and 2 chambered for slosh control. Both designs have worked for my purposes.

The FD3 RX7 I had, was notorious for fuel delivery issues with the stock tank. Using 285 or 295 R compounds, I never had a problem even with an almost completely empty fuel tank.