blue82_z28

Hey, I've been looking around for a boost referenced fuel pressure regulator for a carbed engine. If someone could point me in the right direction it would be greatly appreciated.

junkcltr

iTrader: (1)

Use the one you have. Drill out the air vent hole and install a fitting. That is what most people do.

BDR

I'm using the following:

http://www.aeromotiveinc.com/pdetail.php?prod=20

blue82_z28

so i need to use the aeromotive a-1000 pump in order for it to be used?

blue82_z28

or is there another fpr that can be used with the stock pump, until i decide to upgrade it?

blue82_z28

would this one work? http://store.summitracing.com/partde...636+4294849160

xpndbl3

iTrader: (5)

so you want to use a stock pump with a boosted motor? you'd need a walbro 255 minimum, most of the GN guys run the 340 walbro or aeromotive A1000 or A2000 typically.

firstfirebird

iTrader: (3)

The GN's are SFI, not carbed - correct? Much lower FP is needed for a carb.

xpndbl3

iTrader: (5)

even though it's a lower pressure, the volume of the pump won't keep up either. I'd use a bigger pump as stated, since going lean under boost isn't a great thing and I have to imagine that a boosted motor would need as much fuel as a nitrous motor which needs a minimum of 5psi while spraying and I don't see a stock pump keeping up with them either. Not to mention that a boosted carb motor the FP has to go up 1:1 with boost, so 5psi at idle and 15 psi at 10 pounds of boost, don't see a stock carb pump keeping up, or a stock tpi pump for that matter.

firstfirebird

iTrader: (3)

You are right, what was I thinking?! You carb guys have it easy if the FP only needs to rise 1:1, my stock regulator does that and the FMU I have does 8:1.

xpndbl3

iTrader: (5)

8:1...wow I didn't know that. Like I've posted in the past, not very knowledgable with the turbo motors, but what little I've picked up from the turbo buick guys and my own nitrous results are that the stock pump, whether tpi, or carb/tbi pump won't keep up with 400-ish hp combos let alone needing a rising fuel pressure. Just hate to see the guy try to run his motor on a small pump and see it detonate under lack of pressure. My holley blue doesn't even keep up with my carb at 6psi for the whole run and it flows 90 gph, so for nitrous theres another holley blue needed.

firstfirebird

iTrader: (3)

If you think about it, normal atmosphere is 14.7psi (1bar). If you double the atmosphere (14.7PSIG -guage pressure), you will need double the fuel.

junkcltr

iTrader: (1)

Yeah, the GNs are SFI. Hats off to GM for that back in 1986. Always impressed by that work they did on the GN.

The carb guys don't have it that easy. You need big fuel lines for the low PSI. Usually, it is better/easier to run a carb pump low PSI unit and boost reference it for carb setups. For EFI, you need a pump that will do EFI pressure. Like anything, using a unit not designed for it app. requires mods. When in Rome........