Ford Performance Racing School / KPM800 Fuel system

[KPM Fuel Systems]

So how does this help with the issue?

I thought the fuel starvation occurred because of the shape of the tank, and the fuel pump being on only one side?

Here is the shape of the S650 fuel tank (sorry if that was your totaled car). As you can see, there is a steep "hump" in the middle. In high G force corners, the fuel when, say, half full, may end up all on one side of the tank, away from the pump.

Now, I know some solutions use two fuel pumps, but this looks like just one high volume pump supporting up to 800 horsepower?

What am I missing that makes this deliver fuel when coming out of a 1.2 G sustained turn and then getting gently up to full throttle again, but all the fuel is over on the side where the new KPM 800HP fuel pump is not?

This looks like a relatively inexpensive solution, but I would like to know how/why it works?

The KPM fuel module is a direct replacement to the OE module and fitted exactly in the same position on the LH side of the fuel tank as OE.
Internally there is a tube connected to the fuel module pot that runs across to the r/h side of the saddle tank. The tube "sucks" the fuel across from the rh side to the lh side continuously. This ensures that the fuel module pot remains full of fuel and cascading at all times.
It does this by utilizing "venturi jets" that work by "sucking" fuel from the bottom of the tank into the module pot , keeping it full.
The OE fuel module has 2 venturi jets. One to keep the pot full by "sucking" fuel from the bottom of the L/H side of the saddle tank and the other to suck fuel across from the R/H side of the saddle tank.
This is fine until the r/h side of the tank becomes empty. This eliminates fuel being sucked by one of the venturi jets, therefore the pot staying full now relies heavily on the 1 venturi jet.
Again this is fine until the vehicle starts to corner heavily, sloshing the fuel around the l/h side of the saddle tank. The 1 venturi jet now struggles to pick up enough fuel to keep the pot full while fuel is passing across it while sloshing.This causes intermittent fuel delivery and surging.
All KPM fuel modules are designed with 4 venturi jets. Regardless of the quanity of fuel on either side of the saddle tank, the venturi jets have more than ample ability to keep the pot fuel even under severe high speed cornerring.
Hope this makes sense.
I have attached a link to one of our tech videos, that touches on a visual explanation of how the KPM fuel module and venturi jet system works.

KPM Fuel System Video

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[Junkyard Dog]

The KPM fuel module is a direct replacement to the OE module and fitted exactly in the same position on the LH side of the fuel tank as OE.
Internally there is a tube connected to the fuel module pot that runs across to the r/h side of the saddle tank. The tube "sucks" the fuel across from the rh side to the lh side continuously. This ensures that the fuel module pot remains full of fuel and cascading at all times.
It does this by utilizing "venturi jets" that work by "sucking" fuel from the bottom of the tank into the module pot , keeping it full.
The OE fuel module has 2 venturi jets. One to keep the pot full by "sucking" fuel from the bottom of the L/H side of the saddle tank and the other to suck fuel across from the R/H side of the saddle tank.
This is fine until the r/h side of the tank becomes empty. This eliminates fuel being sucked by one of the venturi jets, therefore the pot staying full now relies heavily on the 1 venturi jet.
Again this is fine until the vehicle starts to corner heavily, sloshing the fuel around the l/h side of the saddle tank. The 1 venturi jet now struggles to pick up enough fuel to keep the pot full while fuel is passing across it while sloshing.This causes intermittent fuel delivery and surging.
All KPM fuel modules are designed with 4 venturi jets. Regardless of the quanity of fuel on either side of the saddle tank, the venturi jets have more than ample ability to keep the pot fuel even under severe high speed cornerring.
Hope this makes sense.
I have attached a link to one of our tech videos, that touches on a visual explanation of how the KPM fuel module and venturi jet system works.

KPM Fuel System Video

Excellent explanation and video, thank you. The video did not use the secondary location, though, so while I can see the four venturis at the bottom doing their job all the way to the bottom of the primary side of the tank, I still do not know how the fuel gets over from the passenger side to the driver side. I am guessing that means that the KPM fuel systems do not change the OEM method of transferring fuel.

What I can gather from the explanation and video you posted is that the white plastic canister stays full. This probably results, in most high g turn situations, in enough fuel inside that white canister to supply the engine, until whatever Ford designed to transfer fuel from the passenger to driver side can do its job again. Am I close?

I saw on a BMW Z4 forum where multiple folks were having the same issue, one of the guys made a bracket and attached a fuel pump to the outside of the canister and connected it to the passenger side with a hydramat, so, basically, the extra fuel pump is always sucking fuel from the passenger to driver side no matter what the driving conditions. It eliminated his high g turn fuel starvation issue.

 

[KPM Fuel Systems]

Excellent explanation and video, thank you. The video did not use the secondary location, though, so while I can see the four venturis at the bottom doing their job all the way to the bottom of the primary side of the tank, I still do not know how the fuel gets over from the passenger side to the driver side. I am guessing that means that the KPM fuel systems do not change the OEM method of transferring fuel.

What I can gather from the explanation and video you posted is that the white plastic canister stays full. This probably results, in most high g turn situations, in enough fuel inside that white canister to supply the engine, until whatever Ford designed to transfer fuel from the passenger to driver side can do its job again. Am I close?

I saw on a BMW Z4 forum where multiple folks were having the same issue, one of the guys made a bracket and attached a fuel pump to the outside of the canister and connected it to the passenger side with a hydramat, so, basically, the extra fuel pump is always sucking fuel from the passenger to driver side no matter what the driving conditions. It eliminated his high g turn fuel starvation issue.

I just searched for a video that we may have done to explain the above. Realized we have not done one on the subject of scavenging from the opposite side of the saddle tank. Video Coming Soon!
For now I will try to explain-

As mentioned previously, the KPM Fuel Module incorporates 4 venturi jets.
One only venturi jet is connected to an internal hose that crosses over from the KPM Fuel Module on the primary (LH) side of the saddle tank to the pick up up at the bottom of the secondary (RH) side of the tank.
The 1 venturi jet only job is to (suck) scavenge fuel from the secondary side (RH) of the saddle tank back into the fuel module on the primary side (LH). It will do this until the secondary side (RH) of the saddle tank is completely empty of fuel.
This is when your fuel gauge reads half/tank or less.
All the remaining fuel is now on the primary (LH) side of the saddle tank.
The fuel module relies on most of the fuel scavenging to be done on the primary side, regardless if the fuel tank is full or empty.
This now allows the KPM Fuel Module to use its 3 remaining venturi jets to scavenge fuel solely from the L/H side of the saddle tank. The huge advantage that the KPM Fuel module has over the OE is that it has a massive ability to scavenge fuel from the bottom of the tank at a very fast rate.
The OE module can only scavenge with one venturi jet, and may or may not be enough to pick up fuel sloshing on cornering at a low level.
The KPM Fuel Module has 3 times the rate of scavenging and does so extremely quickly even on high speed cornering.

I hope this also helps to understand why trying to modify a standard pot with larger pumps or even more detrimental a hanger style fuel system has major drawbacks.

 

[Junkyard Dog]

Yes, good explanation and confirms what I had worked out on my own by reviewing the video and marketing materials, thank you.

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