Deatschwerks DW100 In-Tank Fuel Pump 5VZ, 3RZ, 2RZ

This fuel pump is E85 compatible and ships with the install kit.

The heart of the fuel system is the fuel pump. It must deliver the volume of fuel needed at the required pressure for the rest of the fuel system to do its job. If the pump is not up to the job, then nothing else is going to matter.

Some dispute that an upgraded pump is needed. Let them dispute it if they want, we at UNDERDOG RACING DEVELOPMENT have seen a fuel pressure loss whenever we try to get enough fuel into the engine to meet the needs of the supercharger. The stock pump is fine when used with the stock injectors, but the stock injectors do not flow the required amount of fuel. When the proper size injectors are installed the stock pump can’t flow enough fuel to feed the injectors and meet the demands of the supercharger. That results in a loss of fuel pressure. A loss of fuel pressure on a forced-induction engine is just a disaster waiting to happen.

If you want to see for yourself what we are talking about here, watch this video. The left gauge is the Exhaust Gas Temperature, the center is fuel pressure, and the right is oil pressure. Watch the center gauge. As the RPMs build at full throttle, you will see the fuel pressure drop off, and at the same time the EGT spikes up from the lean out.

This test was done on a 97 Supercharged 4Runner with 305cc injectors and a stock pump. Keep in mind that this truck only had 12,000 miles on it at the time of the test. Convinced yet?

When used with the proper size fuel injectors, this fuel pump flows the fuel needed by the supercharged engine at about 80% of its total capacity and has a low current draw. It fits into the stock pump bracket in the fuel tank and is easy to install.