Description
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 above 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!
Tapout Stage 1 LPFP will help to prop up your entire fuel system, compounding the gains of aftermarket high pressure fuel pumps and/or fuel cams. No special tuning is required for our LPFPs.
The OEM ATS-V LPFP will flow 215 lph @ 70 psi and will support up to 550 whp on gasoline. It is not compatible with E85.
The Tapout Stage 1 LPFP increases flow by 23% to 435 lph with no back pressure and 265 lph @70 psi. It is designed for applications up to 675 whp on gasoline. We include a brand new ATS-V fuel pump housing, retrofitted with a new ZL1 fuel pump.
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.
Check out this screen shot, which shows our fuel system easily maintaining 3,200 psi from 22 to 24 psi of boost through 158 mph on full E85.
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.
