How to fuel the GM Performance LSA and LSA Erod crate engines.

The GM LSA crate engine is one of the best performance bargains offered by GM.

Very refined drivability combined with high-horsepower output give this engine a Dr. Jekyll / Mr. Hyde personality.

It is important to note that the early fueling requirements stated in the GM installation instructions were incorrect. Unfortunately, the correct specifications are still difficult to obtain with any traditional aftermarket fuel system.

The latest and correct fueling strategy is 60psi at idle and ramping to 65psi at wide open throttle (WOT), but this specification is not possible with any aftermarket mechanical regulator.

However, VaporWorx has developed an LSA-specific controller that meets this fuel demand. This system works with the LSA crate engine and the LSA Erod version. Aeromotive part number 66101.

For fuel modules, two excellent choices from GM and Aeromotive are available:

First is the Gen5 ZL1 module. With Fuel Level Sensor is GM part number MU2101 (sensor is 40ohms full, 250ohms empty) and M100291 without the FLS. Good for up to 650FWHP gasoline, this reasonably priced part will work well for engines with mild modifications such as headers, 2-3psi extra boost, a mild camshaft, and a good tune. This is a perfect, low-cost fuel module for the Erod version, especially when CARB compliance is needed.

If more power is expected (better to plan for the future as well) then the Aeromotive Super ZL1 PN 68101 fuel module is the next step up. Good for approximately 750FWHP supercharged on gasoline and using all GM parts it is a drop-in replacement for the stock GM pump. The VaporWorx controller will work well with either version.

When using any version of the GM or Aeromotive fuel module no inline filter is needed. It is recommended that an inline filter not be used since the in-module filter will catch the contamination, hence leaving any inline installed filter clean. This may cause future diagnostics difficult since the inline filter will be clean and the assumption made that filtering is not why the car is not running correctly. In fact, the in-module filter may be clogged and causing poor engine performance.