The stock OEM ATS-V fuel system consists of a low pressure electrical pump in the fuel tank, and a high pressure mechanical pump on the driver’s side exhaust cam. Stock ATS-V fuel systems are already starting to have difficulty keeping up by 18 pounds of boost and 500 whp. We see the high pressure drop off on every ATS-V we tune, as soon as boost is increased. The more boost we add, the worse the problem gets. This problem can be observed when boost is brought in quickly and torque starts to peak. It is exacerbated in the overdrive gears, and engines have been lost for this reason. Article: Tapout LPFP Props up Weak ATS-V Fuel Systems!
The Tapout LPFP is designed for applications up to 650whp. It includes new fuel pump housing, with a much stronger low pressure fuel pump properly adapted, and the entire assembly modified to fit the ATS-V fuel tank perfectly. The Tapout LPFP will increase low pressure fuel system volume by 23%. It flows 435 lph with no back pressure and 265 lph @70 psi. The new Tapout LPFP will help to prop up entire fuel system, compounding the gains of aftermarket high pressure fuel pumps and/or fuel cams. No special tuning is required for our LPFP.
Installation takes a few hours with a helper. First the car must be lifted. Next, drop the exhaust system, driveshaft and gas tank. Replace entire fuel system bucket on passenger side. Then reinstall everything.
Here are some estimated performance capability numbers using Tapout fuel system solutions. The fuel system components themselves won’t produce this much power. These are just estimates of what each fuel system upgrade should be able to support safely.
- 500 whp (gasoline) stock LPFP and stock HPFP
- 600 whp (gasoline) Xtreme-DI OEM fuel cam
- 700/585/475 whp (gasoline/E47/E85) Xtreme-DI HPFP (E85 capable)
- 800/675/550 whp (gasoline/E47/E85) Xtreme-DI HPFP and Xtreme-DI fuel cam (E85 capable)
- 1,000/850/700 whp (gasoline/E47/E85) Tapout LPFP, Xtreme-DI HPFP and Xtreme-DI fuel cam (E85 capable)
The Tapout LPFP can be added to any of the above to provide a little extra padding or safety margin. This unit will not increase overall fuel flow as a standalone modification, since the HPFP is the weakest link in the chain.