fuel pump Q?

**TNcumminsguy** · 10-26-2009, 01:22 PM

I just had my 396 BBC rebuilt with a complete comp cams top end kit with a 278/292 cam, pro mag push rods, full roller rockers, etc.. Bottom end is just a simple rebuild with steel crank etc and now its a 402. It has a tunnel ram with dual holley 450's thats came with he boat when I bought it. The boat needs a fuel pump now and I have no idea how much gph my boat needs? I know about diesels but not gas motors

**BIGA** · 10-26-2009, 03:56 PM

most any pump will do for your set up. the stock gm mechanical pump will be enough. best to run the approved marine one, the entry level holley will provide more than you need. you can upgrade to your preference, but as you step up you will get into regulators that will require a return or bypass.

**TNcumminsguy** · 10-26-2009, 04:07 PM

it had a holley electric fuel pump and is set up to run one on it but was worn out when I bought the boat so I took it off, forgot to mention that. So a holley marine blue electrical pump at 70gph would be fine?

**sleekcrafter** · 10-26-2009, 06:09 PM

Originally Posted by TNcumminsguy

it had a holley electric fuel pump and is set up to run one on it but was worn out when I bought the boat so I took it off, forgot to mention that. So a holley marine blue electrical pump at 70gph would be fine?

Don't run an electric pump unless you have too. Holley electric pumps are on the bottom of the list as far as pumps go. Like Big A said a good mechanicasl pump is all thats needed. Holley and Edelbrock are bolt on pumps and come in marine versions. Electric pumps need relays and safety switches to be safe, and you know how water and electric get along...

**TNcumminsguy** · 10-26-2009, 07:33 PM

http://www.summitracing.com/parts/HLY-712-454-11/ this what I should run instead of my electrical?

the boat came with an electrical fuel pump and is set up for one, on the front of the tunne ram there is a fuel rail thing with 4 ports on it, one has fuel psi gauge,one blocked, and two are running to the carbs. If I can keep all of the same fittings and stuff then I will switch to mechanical

**sleekcrafter** · 10-26-2009, 10:49 PM

This is what your looking for http://www.summitracing.com/search/B...c&autoview=SKU

8 psi is borderline needing a regulator. Don't forget the push rod for the pump

http://www.summitracing.com/parts/ARP-135-8701/

**Darkside's Calling** · 10-27-2009, 02:22 AM

Also check to make sure that no bolts interfere witht eh fuel pump puch rod... May only be a SBC thing, but one of the front mount bolt holes extends right inthe the pushrod tunnel and if the bolt is too long it binds the pushrod...

Ask me how I know....

**slf16** · 11-11-2009, 08:58 PM

Go mechanical with regulater plum off each side with one gauge and set to6.5 to7.5psi

**7819foot** · 11-12-2009, 02:36 PM

Mechanical is the simplest way to go.
Carbs don't care about pressure, just volume.

If you go electric:

I have a Ford 460 tunnel w/dual Holley 450's.
I put a Summit 90gph/5-7 psi pump on mine.
Works perfectly.
I get 60+mph at 4700rpm's.
Cost me $80.

**Bies** · 11-12-2009, 03:42 PM

If electric you do need regulator, mechanical is the way, Marine only, some good comments have been made, carbs do care about pressure, to much and you will overcome the needle and seat, richness is not your freind. Good luck

**7819foot** · 11-12-2009, 04:56 PM

By saying "carbs don't care about pressure" I mean high pressure.
5-7psi is all you need.
All you need to do is keep the floats full.

Most electric pumps are rated at either 5-7psi, or 12-14psi.
The needle and seat on a Holley can handle up to 8psi, so with the lower rated pump you do not need a regulator.

Running pressure with mine is about 3-5, so that is just fine.

With the 14psi pump you do need a reg, but I don't recommend that setup anyway for a normally aspirated engine.

My boat runs happily with this setup, and the plugs are clean after a day at the lake.

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