Dual Fuel Pumps for High HP applications

[blake261]

X-post from the drifting section

Does anyone have pictures of their AN feeds and returns in a stock basket?

Also, has anyone used the other side of the tank for another fuel pump, not to resist starvation, but to actually add more fuel?

I have (what I hope to be) a 700HP LS Turbo setup. 96lbs injectors, China Fuel Rails, -8an feed and -6 return, Aeromotive FPR, Aeromotive 10 micron filter, and two walbro 450's. I want to run E85.

I would like to put one pump in the driver side and one pump in the passenger side of the stock tank, Y- the feeds and run them at the same time (or maybe on a hobb's switch). I believe the dual fuel pump set up's for starvation use the driver's side pump as a transfer pump (to get fuel to the passenger side). I know Rally Road makes a bracket, but if I can avoid that cost I would like to.

This means I have to get the AN lines out of the stock baskets (bulkhead fittings) for the feed, and back in for the returns. I assume that the return can just go into one side of the tank (like stock) and does not have to be split. I have a good Idea how I'm going to do it, but would like to see some other setups.

Can anyone think of any other problems I'll run into?

TIA!

[vollosso]

Get the rally road hangar :/

I have split pumps.. It was a mega pain in the ass. (This is coming from a guy who fabricates headers and works in hex for fun)

The driver side of the tank isnt sumped and slopes away from your pump. Youll have to tear out your syphon return. The stack height of the pumps is hard and doesnt fit well.

What you end up with is reduced effectiveness of the pass side pump sump, feeling worried on low tank, and 8 hours of jerryrigging.

Chikinhed has a nice solution if you want to drain the tank and glue a pump in the back corner. You can save your scavenge this way... sigh, this topic makes me sad.


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[vollosso]

Oh and side note thats a lot of pump. You can do a single 450 for 700bhp. Especially since youll be at lower boost pressures.

Say 15psi boost and 43 base thats a total of *58*, find the curve for those pumps i bet they flow 700bhp at 68psi each.


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[blake261]

Thanks for the insight Vollosso!

Honestly, I've already bought all the fittings, and taken the tank down, so now I'm glad to hear that someones done it.

I never used more than a half a tank of 93oct with the old setup, but it may very well be possible this time. I was hoping that doing big dual pumps would have the added benefit of being able to cover the fuel needed if one went dry.

I'm also going to run e85. I know the set up is still overkill, but if I build the motor, I wont have to change them.

[vollosso]

Just glue the pump in the bottom aide of the driver aide. You'll be fine then.

Youll need a big fpr to handle the dual pumps.

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[blake261]

I have an Aeromotive A1000 boost referenced FPR

[vollosso]

I have an Aeromotive A1000 boost referenced FPR

That may not be enough :p


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[jakermac]

Say 15psi boost and 43 base thats a total of 68

New math?

[vollosso]

New math?

Ahh! haha. Knew it seemed high.


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[fallguy]

Oh and side note thats a lot of pump. You can do a single 450 for 700bhp.

On pump or race gas, but i don't think one 450 will knock out 700 on E85. Or would it?

[bimerok]

Don't really see one feeding pump on each side of a tank very practical. You will almost certainly face the issue of running one of the sides/pumps dry, which will kill that pump in a short order for one. And two, running one of the pumps dry will defeat the purpose of having two feeding pumps. The two sides of a tank connect at very top for 96+ cars, so removing transfer pump will create issues. Also, eventhough the pumps might already have it to certain degree, but you would probably still want to run a check valves on each of the pumps to avoid extra "back pressure".

Like it was mentioned above, 700hp is not crazy high by today's standards and single pump solution would be best in my point of view

[fallguy]

Im having these same issues with planing my fuel setup. We don't have E85 here, best we have is chevron 94. Im looking at a single 450 and 88LB injectors. im just not too sure if that will be safe to bring it up to 700whp, my motor is a forged L33 5.3L

Im looking into water meth.

[chikinhed]

Don't really see one feeding pump on each side of a tank very practical. You will almost certainly face the issue of running one of the sides/pumps dry, which will kill that pump in a short order for one. And two, running one of the pumps dry will defeat the purpose of having two feeding pumps. The two sides of a tank connect at very top for 96+ cars, so removing transfer pump will create issues. Also, eventhough the pumps might already have it to certain degree, but you would probably still want to run a check valves on each of the pumps to avoid extra "back pressure".

Like it was mentioned above, 700hp is not crazy high by today's standards and single pump solution would be best in my point of view

That's strange. I've been running a 450 in each tank for a few years now without extra check valves or issues. They are plumbed in parallel and the return is split equally to each side.

I was having a fuel starvation problem during a hard pull and in long right hand turns below a half a tank with a single pump. With two pumps I no longer have either issue. I also like the idea of redundancy but if one pump fails, the other side will eventually run dry if I'm below a half a tank.


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[blake261]

They are plumbed in parallel and the return is split equally to each side.

Why did you split the return? I was hoping to just dump it back into the driver side. You still have the siphon system correct?

[vollosso]

Why did you split the return? I was hoping to just dump it back into the driver side. You still have the siphon system correct?

You have to split the return or one side will run dry.


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[lloydjoe]

If the return only goes back to one side only with a pump in each side then you will eventually have one side empty starving the pump.

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[chikinhed]

The siphon or jet pump could not keep up so I removed it.


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