Guys with BOOST, what mech fuel pump??
 

Just curious as to what mechanical pump you guys that are running a boosted set up are using?? Looking at about 615ish HP(sbc), looking for a good mechanical( not belt driven) pump.. Post up please or let me have some info..

Thank you

John jr

can't help you on the mech I run a aeromotive 1000 and boost referenced regulator with return to tank..

Depending on what GEN block you have, you may not have many options. I have a GEN V block and there isn't a pump mount on the block. When you say boost are you referring to a pressurized induction? If so then electric with boost referenced regulator. If you are referring to boosted hp then you can run the Merc HP pump it's good for at least 120gph. I'll be pushing 700+ when I'm done with a Merc pump.

not to hi jack your thread..but I just changed over to an electric pump...should I be running a boost referenced regulator instead of a standard one? what does it do different?

You will need a 6 port high volume like a Holley, most are 110 gph, probably need a regulator also

I really want to stay away from a electric pump. Not that they are bad, I just do not like the idea of them on a boat.. The carb will be in a blower box that is being pressurized.. Yes I am aware that I will want a boost ref regulator.

Thanks
John jr

then in that case you HAVE to run a electric and a boost referenced regulator !!! if you don't when you make boost the enclosed carb will force the fuel pressure down to nothing and lean out then bad things are going to happen....with a non pressurized carb not the same deal...just need to maintain the correct fuel pressure 6-7....pressurized MUST increase fuel pressure 1 lb per pound of boost from the 6-7...

Buy the meaning pressurized, is this because the carb is in the box?? What if it is changed out for a blower hat??

John jr

If you have a block with a fuel pump mount, you can run a Stewart Racing Pump and regulator. This is a mechanical pump that can put out enough pressure and flow for a pressurized EFI system. The regulator is accurate enough so you can use a mechanical pump with EFI. It's the way I would go if I could, GEN V blocks don't have the fuel pump mount on the block.

http://www.racepumps.com/MarineIndex.html

You only need to run boost referenced if you are pressurizing the carb or EFI system.

not supposed to run a hat, they are not CG legal as you will blow some fuel out thru throttle shafts, I can tell you procharger says elec pump w/ referenced reg....you have to over come the boost inside the carb to maintain fuel pressure....do you have the procharger manual ?? pretty clear in there...

DO NOT USE A HAT IN THE ENGINE ROOM,IT IS DANGEROUS.forget about a mechanical pump with a procharger,use aeromotive electric pump with boost referenced regulater,ive been there,nothing else works,trust me!

Check out Weldon Racing pumps too. They make some good stuff.

http://www.weldonracing.com/product/...Regulator.html

I need to agree.........THANKS

Talked to PC, they said there is no difference between running the carb in the box or the hat.. As it seems, I am not going to spend 5$$$ on a mechanical pump, as most of them are good to about 8psi, I will be well above that. So looks like it will be a electric pump.. Not thrilled about it, but if it is the only thing that will work, then what the hell...


John jr

You can always tie a warning buzzer or alarm to come on in the event you lose pump pressure.

Fixx
 

just to add,,you will need to add jet extensions and notched solid floats...tuneing will be no piece of cake either,you will need to open up the passages in the metering block under the pv's according to which jet you use..auunlar boosters help also or a aerosol carb will be better of F the carb and go with this..
http://www.professional-products.com/EFI_3.php

Carb will be done by a professional carb builder, that is pretty good with blower carbs.. Thanks for the info, link though.. :drink:

John

Fixx
 

unless they have your engine on the dyno then i would have to say just a professional carb builder wont get a procharged carberator rite,,you will have to retune it once it hits the water..you will see how fun it is with the carb box! :drink:

Thanks for the advice. Have to get me a electric pump, I already have a FPR.. Just have to get the carb done, we can go from there..

Thanks
John jr

couple of things, make sure carbs are for BLOW thru, not just blower carbs..not the same !! put a switch on the dash to be able to turn off fuel pump as a override(trust me) also make sure you run a boost gauge and a fuel pressure(electric) in the dash...you will need to do a return to the tank...can use a diesel fuel tank sending unit that has the fitting already there...I have done all these...

The Stewart mechanical pump will handle up to 1875hp in a blow through arrangement. I've seen them used in EFI applications with pressure up to 75psi and 450gph.

Yes have already taking this into consideration.. Thanks :drink:

Boat will have a FP gauge, AFR, boost gauge.. I have a few gm bucket hats, with return ports in, so that should not be a issue at all, for the return.. Yes very well aware about the diff in blow/draw through carbs..

Going to check into that pump also.. Thanks for posting up..

Thanks guys


John jr