Project Toyota Supra MKIV: Part 8 – Fuel and Engine breather systems


The engine will be slurping from dual Walbro 485 fuel pumps, which are each rated at 400 LPH at 40 PSI fuel pressure and come with installation hardware and connectors.  The E85 compatible pump offers very high flow with quiet operation in a small package that “drops in” to many factory sports cars, including the Mitsubishi EVO X and some Subaru STi’s.

Previously, the Supra made over 750whp with a shot of methanol and dual 255 LPH Walbros that never failed pumping 93 octane.  That shouldn’t be surprising—after all, Walbro is the OE fuel pump manufacturer to several car makes, and the pumps are proudly made in the U.S.A.

Why the large jump to 400 LPH pumps, you ask?  After all, we’re not shooting for 1500whp.  The reason is that they’re E85 compatible, meaning they have stainless parts inside that won’t corrode.

While one Walbro 485 pump would suffice for an 800whp setup on pump fuel, it’s different with Ethanol, which requires about 35% more fuel than pump gas to make the same power.  With twin 485’s, we should be easily good for around 1000whp on E85.

The Walbro 485 fuel pump also incorporates two sets of composite plastic blades on a common shaft (like a turbine jet) for quiet and efficient in-tank operation.


The PHR Triple Walbro Pump hanger is made of black-anodized 6061 T6 aluminum, and specifically for the 2JZ-GTE.  It’s reported as the world’s only triple hanger to house these pumps in an in-tank design for this car, and is CNC precision-machined for an exact fit.

For power junkies looking to get up to 1900whp on racing fuel or up to 1400whp on E85, the triple pump hanger is the only one available to make this setup possible in a quiet, in-tank design.  But we’ll just be using two pumps.


The back of the hanger has machine bolts that allow adjustments so that the fuel pumps can be mounted spot-on, picking up every last drop of fuel in the tank without causing interference.

Here’s a look at the distribution block on top of the hanger.  The entire unit is anodized black so that it stands up to the corrosive properties of alcohol, methanol or E85 fuels.

And here is our PHR hanger, installed.  While MKC used black fittings for the two -8AN feed lines to match the rest of the engine bay, they were able to reuse one of the old Jiffy-Tite quick-release fittings (gold one) that the car had previously.

The connector at the bottom of the picture was starting to see its last days, and thankfully won’t be used anymore.  MKC will be hard-wiring the system with PHR’s supplied Military-spec wiring that ends in a Mil-spec circular connector to guard against fuel soak.

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