Question 1

Do I need an HPFP upgrade for my B58?

Accepted Answer

Only if you want to run more ethanol or more power than the stock pump can support. On Stage 1 or Stage 2 with pump gas, most cars do not need one. If your logs show fuel pressure dropping on ethanol, it is time.

Question 2

What does a flex fuel kit do?

Accepted Answer

It reads the ethanol content of your fuel and sends it to the tune. The tune then adjusts timing and fueling on its own. You can fill with any mix of pump gas and E85 without reflashing. It needs a flex-capable tune.

Question 3

Do I need to upgrade the low pressure pump too?

Accepted Answer

Usually yes, once you run higher ethanol blends or port injection. The LPFP feeds the HPFP. If it cannot keep up, the high pressure side will not hold pressure either.

Question 4

Will a Gen 1 HPFP fit my Gen 2 car or Supra?

Accepted Answer

No. Gen 1 and Gen 2 B58 engines use different fuel systems. The Gen 2 pumps listed here fit both G-series BMW and the A90/A91 Supra.

Question 5

Do I need port injection?

Accepted Answer

Only for big-turbo builds or full E85 at high power. It adds a second set of injectors and needs a controller, an upgraded LPFP and a custom tune. Most owners do the HPFP and LPFP first.

B58 Fuel System Upgrades: HPFP, LPFP, Port Injection and Flex Fuel

DeatschWerks DW440 440lph Brushless In-Tank Fuel Pump w/ Install Kit - Supra A90

Radium Engineering Toyota MK5 Supra Port Injection Kit

Snow Performance Stage 3 Boost Cooler (EFI) Water-Methanol Kit

B58 Fuel System Upgrades: HPFP, LPFP, Port Injection and Flex Fuel

Parts

DeatschWerks DW440 440lph Brushless In-Tank Fuel Pump w/ Install Kit - Supra A90

Radium Engineering Toyota MK5 Supra Port Injection Kit

Snow Performance Stage 3 Boost Cooler (EFI) Water-Methanol Kit