Upgrading Fuel Pump

[Janner_Sy]

I paid online

[xxx_mojo_xxx]

What's the maximum pressure that these after market fuel pumps can deliver?

[Janner_Sy]

no idea mate, but its more than enough for what jonnyC is pushing out of his, so i doubt you'll max out these

[Hedge]

I seem to remember that they are 140bar.

[xxx_mojo_xxx]

The reason I ask is because somewhere I read that the OEM fuel pump dished out 130 bar. 

Doesn't seem like much of an improvement to 140 for close to 800 bucks...

[gazbutS3]

the oem pump will deliver that higher up the rev range, but not in the mid-range

[john_o]

plus its more about flow than just pressure...

[xxx_mojo_xxx]

plus its more about flow than just pressure...

As my wife keeps reminding me... 

[bacillus]

plus its more about flow than just pressure...

As my wife keeps reminding me... 

 

[john_o]

plus its more about flow than just pressure...

As my wife keeps reminding me... 

 

[vRStu]

As John quite rightly says the pump upgrade is to increase flow/quantity as opposed to pressure.  What this does though is enable a greater pressure to be maintained in the fuel rail in the mid rev range by maintaining a higher volume of fuel in the rail.

The OEM fuel rail has a pressure relief which IIRC is maxed at approximately 130Bar.

The issue arises because the pump is being driven directly from the cam which means it is directly related to engine speed.  At mid range engine speeds the OEM pump cannot flow enough fuel to feed a modified engine.