Need a 7 (potentially 6) second intank fuel pump on ethanol? Mechanical fuel pump too much work and potentially prohibited or defectable by the authorities?


We may have a good alternative for you.. the ELIXIR 1380lph single in-tank pump.


This is a video of our old test back in May 2019: 1240 liters of fuel flow per hour at 110 psi. That's an EASY 7 second capability from ONE fuel pump! (@ between 16~49 amps at peak load). PWM it, drop the current and flow to suit lower boost levels to make it efficient instead of running at full 100% flow all the time. So, even if you run a low boost at high RPM, it's not going to overflow inefficiently and heat the fuel like a mechanical pump.


With these ELIXIR 1380lph pumps, you can control the pump speed and flow (see video for how much flow) compared to a mechanical setup which you can't control because the more flow, the more the pressure rises which then causes temperatures to rise (P= V/T). While the ELIXIR 1380lph pumps will put a little heat into the fuel, it isn't an issue considering the huge amount of flow.


Benefits:

- Run it inside a well designed stock fuel tank boat such as the R35 GTR and fuel a 7.4 second beast on e98, with more room for a bigger flow.

- Vary fuel flow with PWM from an ECU output by reducing current to only 16amps with 700lph at base flow and progressively driving up flow and current to peak loads.

- Easily supports 3000cc ~ 3500cc / min fuel flow per cylinder on a 6 cylinder turbo. More flow coming soon!

- Compact in-tank fuel tank solution or in-tank surge tanks at the rear of vehicle. (Ask about our surge tanks with this pump built in.

- Large pickup strainer to filter the fuel before delivery

- No external high amp relay needed

- No cooling fan on electronics needed (reduces failure if fan fails or clogs due to dust or bad bearing). No heat transfer tubes needed.

- Compact sized electronics with resettable fuse.



Below are some of the drawbacks with mechanical pump setups:

Now, to get a mechanical fuel pump to work well, there is a heap of things to do! It is expensive and requires engine room and weight to get results and on top of that there's also labour costs and time.


Here's a list of things to consider if we wanted a mechanical pump to flow more than 1000lph:

- Defectable by the authorities on the spot

- A good mechanical pump. Then, figure out which size will flow enough.

- A huge regulator to bypass if it's too big.

- Mechanical pumps don't like suction. This means we'll need to feed it with a surge tank in the engine bay that is mounted high. Yes, we can use gravity to feed it, but having an accident with that much fuel in the hot engine bay is a hazard waiting to happen.

- Customised CNC brackets for mechanical pump

- Lots of lines and fittings for mechanical pump. Big fat lines so as to not starve the pump means plenty of points or fittings that can leak. Should the floor where the huge lines run through, scrape the road, it could potentially cause a fire.

- A new belt to figure out where to drive from, or get a cam drive, which means more machining work or buying an expensive kit

- If not designed with tensioner correctly, it'll be a flying belt just like the 1969 Monaros.

- A crank or cam drive pulley to suit

- If there's priming issues, need to plumb in an electric fuel pump to prime, tee joint and check valves or a surge tank in the engine bay, which if there's an accident, there's no safety cut off for a ruptured tank.

- Larger long suction lines from tank to pump so it won't collapse under the high flow. Furthermore, not all rubber lines like alcohol fuels and when they start blistering, getting soft and going to bits; it will end up clogging filters, pumps and injectors. The alternative is to get expensive good designed PTFE lines that work well under suction.

- Larger outlet lines from the mechanical pump to the rail.

- Any drilling or welding up the fuel tank requires removal work. This is hazardous if we forget to wash tank out first to remove fuel residue. Alternatively, use a surge tank or lift pump.

- Lots of heat shielding for fuel lines as they are large enough to pass through the tunnel next to exhaust, keeping the fuel super hot!

- A massive bypass fuel regulator with multiple AN10 fittings to handle excess fuel as the revs push more than the engine can consume on a too large sized mechanical pump. If you can't bypass enough, fuel pressure rises and some injectors start getting erratic.

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