Parallel Fuel Pumps

[RedFR-s]

I'm working on fitting a second OEM pump into the passenger side of the saddle tank. I saw a closed thread from Accelerated Performance/Visconti about them doing so, but the kit was over $1k. Reason behind this is to prevent leaning out during cornering/powering out of a tight right corner under 1/2 tank of fuel. Also increased fuel volume for boost/E85.

I was wondering if anyone else has rigged up a setup like this. I'm planning on opening up the canister and tank to get a better idea what I'm looking at but I was thinking of splicing the passenger pump into the power for the drivers pump and putting a Y connector to send both pumps feed up front. Need to open the canister to see about mounting the pump still.

I'll document all my investigations when I get some time to work on the car, for now I'm asking if anyone has experience with this, and any problems they ran into.

[Tcoat]

Not sure what (if anything) is available but what about just getting a single higher volume pump and then just splitting the intakes off into both sides of the tank? Installing a second pump will be major surgery for very limited gains.

[Tedderple]

What about the hydramat for scavenging fuel?

http://www.motoiq.com/MagazineArticl...-Hydramat.aspx

[GsxrMe]

Originally Posted by Tedderple

What about the hydramat for scavenging fuel?

http://www.motoiq.com/MagazineArticl...-Hydramat.aspx

Agree

[Ultramaroon]

It seems like the design of the venturi pump for the right side of the tank is either flawed or the location for the pickup is.

Just spitballing. I've wondered but never seriously studied the issue.

[RedFR-s]

Originally Posted by Tcoat

Not sure what (if anything) is available but what about just getting a single higher volume pump and then just splitting the intakes off into both sides of the tank? Installing a second pump will be major surgery for very limited gains.

The issue is the venturi system to get gas to both sides of the tank especially when at lower levels. Are you talking about adding a pump external to the tank and drawing from both sides, or higher volume on the driver's side piped to pull from both sides?

You got me thinking now though. it might be easier to T the pump intake and run a line out of the canister across the tank to the passenger side. If I combine that with the smaller hydramats then I don't have to worry about air going through the pump from the empty canister.

[RedFR-s]

Originally Posted by Tedderple

What about the hydramat for scavenging fuel?

http://www.motoiq.com/MagazineArticl...-Hydramat.aspx

That might work by keeping the fuel trapped on the driver's side. Connect it directly to the fuel pump, it would replace the canister. I will look further into this. Thanks.

Anyone used these on our cars in the stock tank by chance?

[RedFR-s]

Originally Posted by Ultramaroon

It seems like the design of the venturi pump for the right side of the tank is either flawed or the location for the pickup is.

Just spitballing. I've wondered but never seriously studied the issue.

http://www.ft86club.com/forums/showthread.php?t=36231

Post #32 explains pretty well the issue. Just trying to avoid a $1k+ solution for it if possible.

[Tcoat]

Originally Posted by RedFR-s

The issue is the venturi system to get gas to both sides of the tank especially when at lower levels. Are you talking about adding a pump external to the tank and drawing from both sides, or higher volume on the driver's side piped to pull from both sides?

You got me thinking now though. it might be easier to T the pump intake and run a line out of the canister across the tank to the passenger side. If I combine that with the smaller hydramats then I don't have to worry about air going through the pump from the empty canister.

Was thinking a stronger single pump on the right and teeing off to both saddles.

[RedFR-s]

Originally Posted by Tcoat

Was thinking a stronger single pump on the right and teeing off to both saddles.

I think I've got it figured out. Radium engineering has an adapter to 5/16 line from the fuel pump, stainless steel T from there out to a 8"x3" Hydramat on each side of the saddle. Would cut the bottom of the canister out and essentially by pass it. All in it's under $500USD.

This is why I love the forum and no idea is a bad idea.

[Tcoat]

Originally Posted by RedFR-s

I think I've got it figured out. Radium engineering has an adapter to 5/16 line from the fuel pump, stainless steel T from there out to a 8"x3" Hydramat on each side of the saddle. Would cut the bottom of the canister out and essentially by pass it. All in it's under $500USD.

This is why I love the forum and no idea is a bad idea.

Yep that is pretty much what I pictured. Beats hell out of trying to add a second pump.

[slowest86]

Radium has a nice surge tank. http://www.radiumauto.com/MPFST-Mult...Tank-P271.aspx

[RedFR-s]

Originally Posted by slowest86

Radium has a nice surge tank. http://www.radiumauto.com/MPFST-Mult...Tank-P271.aspx

I'm looking to avoid surge tanks as I don't want fuel outside of my tank. Run into all kinds of issues for many different racing series and tracks.

[Hags86]

I was talking with one of the TR86 Race Teams here in Australia (the Toyota spec racing series) about this. Their configurations are all specified by the race series organisers who do some engineering and determine what configs all the cars must run.

It is my understanding that they have installed a second OEM fuel pump in the left hand saddle. It's role is to pump fuel into the right hand side saddle where the standard pump and pickup is.

Seems like a simple solution that doesn't require an external surge tank. I'll try and find out some more info but if anyone has done this I'd like to see the details.