Thinking of running the new line of Walbro (Part #F90000267) as I'm running a stock pump at above rs2 levels...
Seems like there is a packaging constraint I may encounter...
Quoted from Walbro:
"Due to the specifications of this fuel pump, please take note of the following:
The larger diameter at the base of the fuel pump will prevent this from being an OEM drop-in replacement on most applications. Modifications to the mounting bracket, wiring, and connector may be required for proper fitment. We recommend 14 AWG wiring to account for the current draw this pump has.
Technical Pump Specifications:
Overall pump length: 121mm
Main Housing Diameter: 39mm
Lower Housing Diameter: 50mm
Fuel Inlet Diameter: 11mm OD
Fuel Outlet Diameter: 11mm OD
Flow rate: 400LPH @ 40PSI
Test Voltage: 13.5 Volts"
The stock pump is about 43mm, so the top part of this pump should slide right in. The base, however, is where I can't remember if there was enough room down there from when I did an 044 in my previous car.

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