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Jordo! · 10-23-2012, 03:44 PM

Does anyone have fuel pressure data for either of those pumps? I know it will vary with boost, but any idea on what it hovers around?

What about stock? Does the stock pump have a built in regulator, and if so, is that reused with aftermarket pumps?

EDIT: Okay, can't find solid answer on the psi, but looks like typical internal regulator, so psi will drop as boost increases. If stock is 43 psi, the walbro 255 (rated up to 60 psi) may be strong enough to hold 43 psi, in which case you can select injectors based on that.

So other options include a different regulator (looks like an old method was to drill out the stock regulator -- although I wonder if it will run rich at idle?) or use an adjustable regulator that rises fuel pressure with boost pressure.

I'm surprised there isn't more info on stock vs aftermarket pump fuel pressure at various boost levels on here? Anyone have this info?

10-23-2012, 03:44 PM	#5 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	Does anyone have fuel pressure data for either of those pumps? I know it will vary with boost, but any idea on what it hovers around? What about stock? Does the stock pump have a built in regulator, and if so, is that reused with aftermarket pumps? EDIT: Okay, can't find solid answer on the psi, but looks like typical internal regulator, so psi will drop as boost increases. If stock is 43 psi, the walbro 255 (rated up to 60 psi) may be strong enough to hold 43 psi, in which case you can select injectors based on that. So other options include a different regulator (looks like an old method was to drill out the stock regulator -- although I wonder if it will run rich at idle?) or use an adjustable regulator that rises fuel pressure with boost pressure. I'm surprised there isn't more info on stock vs aftermarket pump fuel pressure at various boost levels on here? Anyone have this info? __________________ Enjoy it. Destroy it. Last edited by Jordo!; 10-23-2012 at 04:04 PM.