Need fuel pump education

[sledge42hammer]

I was searching MAP's website for a fuel pump and when i a came accross them, there are 255 walbro high pressure and 255 walbro NON high pressure. My question is what are the differences as far as application goes? I want to make sure I get the right one. Thank you my fellow dsmers


Sledge

 

[GsXdSmKingGsX]

High pressure is what you need. If you need. Im just gunna tell you this.

 

[Absit]

The HP pump's flow doesn't drop off as hard at higher fuel pressures.

 

[sledge42hammer]

Why would they even produce the non high pressure then? They are the same price.

 

[Absit]

Probably because DSMs aren't the only cars in the world, maybe some cars can take a 255 without an adjustable fuel pressure regulator (some DSMs do it too, though it's not recommended). And now someone that does run a 255 (not HP) without AFPR will chime in saying it's fine. On naturally aspirated applications you'd have no reason for the HP either.