Different Fuel Setup?is This Possible?

[wsln33]

In my new car ill be running 2 044's. If one flows 360l/ph, thats 12 litres per minute (6 litres per 044) that will be going around to the engine bay and back getting heated up. Is it possible to have this sort of setup? Have the 2 044s in the boot, run the 2 outlets from the 044 into one, have a tee that comes off this line that goes to the engine bay, the other side of the tee goes to the fuel reg in the boot.

Therefore the only fuel going to the engine bay will be used?

[paulr33]

out on a limb here but it sounds like the fuel will get heated up too much

it will drive like poo if the fuel is heated up, like if you have a mega big pump and idle in traffic for a bit, the pump keeps pushing the fuel back and forth to the engine as you have a mega rated pump, but the fuel keeps getting warmer and warmer, and when you eventually use it its boggy and sluggish

[Mr. Oizo]

this makes no sense

fuel pump -> fuel rail -> fuel reg

the fuel reg has to be after the fuel rail

[Faid]

that doesnt have to be so, the honda K20 utilizes the setup where there is no fuel return, they use a fuel reg to ramp up the pressure. dont know the exact diagram of that setup, but i am a 100% that the fuel line enters the rail and there is no return.

[Mr. Oizo]

that doesnt have to be so, the honda K20 utilizes the setup where there is no fuel return, they use a fuel reg to ramp up the pressure. dont know the exact diagram of that setup, but i am a 100% that the fuel line enters the rail and there is no return.

yes, but the k series engines work on a constant fuel pressure

skylines use intake manifold pressure to increase fuel pressure as boost increases

[rob82]

Gen3's are the same along with the new cobra's only 1 supply line to the front of the car. There is definate value to it, all you have to do is run a vacumm line to the back of the car. Might just take a little bit more tuning to get the acceleration enrichment right. Give it a go.

[Abo Bob]

Vacuum doesn't travel as quickly as electricity though.

[wsln33]

Some people get it, some people dont. The fuel reg will be after the rail if the tee for the rail is before the fuel reg in the boot. By keeping the fuel reg in the boot the fuel wont have to travel up to the engine bay and back. It will only be cycled around in a small circle.

[Abo Bob]

So fuel goes from, say, surge tank out a hose with a t-piece, one direction goes to the reg and then back to the fuel tank, the other goes to the engine?

[Mr. Oizo]

So fuel goes from, say, surge tank out a hose with a t-piece, one direction goes to the reg and then back to the fuel tank, the other goes to the engine?

wont that be very inefficient?

[Adriano]

The fuel in the fuel rail will only be flowing as fast as the engine is using it, so by the time the fuel travels to the last cylinder in the rail, it could have been in the rail for up to 1 minute if your going down a hill with minimal throttle, easily long enough for the engine heat to vaporise the fuel causing vapour lock and extremely lean running, and vastly different a/f ratios on different cylinders. Manufacturers do it the way they do for a reason, the fuel cools the rail. If your concerned about the fuel heating up, put a fuel cooler(oil cooler) on the return rail, but have an accident at your peril.

[Mr. Oizo]

also, HPC coatings for the fuel rail

[Adriano]

old jag xj6's had a sleeve around the fuel rail that had a/c gas running through it to stop vapour lock.

[wsln33]

Sounds like its not a good idea. I might try to work out how to run one pump only and then get the other one to switch on when needed. That way it would save all the fuel circulating around and getting heated up.