upgrading gen 6 mechanical fuel pump
 

how much HP with the stock fuel/sea water pump support? has anyone tried the new KEPP fuel pump upgrade? I have a fresh pair of 540's that I don't want to starve for fuel

Me too ........ same question, 'cept I have a single BB, close to the same CI.

Anyone ???

A Holley or Carter high volume pump diaphram assembly will screw right on to the Merc armature housing. Works great!
Dave

Merc. used the stock fuel/water pump on their SC-600hp. The KEPP fuel pump upgrade is good for 700hp. This Billit pump is rated for 850hp.

Dave, Have you tried/used a Holly or Carter diaphram on the Merc housing ? If so, which one did you use and how did it work out for you ? I have a 557 that should max out in the 5700-5800 RPM range. I'd like to stay with the mechanical pump if possible.

Thanks - Bill

Bill,

What's the PSI on the pump you mention ?

Bill,
The Holley 12-454-11, 12-454-13 and 12-454-20 will all bolt up as will the Carters with the six screw flange (the Merc armature housing is a Carter unit)
Yes, I have used the -11 for a supply pump for the high pressure pump on supercharged EFI setups up to 1000hp. The -13 and -20 will require a regulator.
Dave

Thanks Dave !!

It's 8 psi and 1200 lbs. per hour.

I think I'm going to try the KEPP pump, they are self regulated right? who's got the best price on a pair??

Yes, they are self regulated , sent you a PM.

anyone else tried this set up? I see jegs sells a marine holley 712-454-11, I'm wondering if this would bolt up to the seawater assembly http://www.jegs.com/i/Holley/510/712-454-11/10002/-1

The only part of that pump that is marine (the armature housing) gets thrown away so it wouldn't make any difference if it's marine or not. You don't remove the housing from the sea pump assembly; only the diaphragm assembly.

Dave

I am using the KEPP pump. Nice unit. One thing nice thing - it doesn't leak fuel into the pump oil no where near as bad as stock. As far as fuel pressure - no idea, other than adequate.

I am using the KEPP pump, and I am very happy with it. With their pump you do not need to run a pressure regulator.
I run about 7 to 8 lbs of pressure with a 1/2" fuel line.
I'd recommend using them.

Try this link. CV Products billet fuel pump as a direct replacement for the Merc Sea Water Pump combo. To be on the safe and correct side of the psi issue, IMHO you should still run a regulator. Even with these elite units.
http://www.cvproducts.com/cv/catalog...el_Cooling.pdf

CV Products #CV2630

The motors in my boat started life as Merc SC600's. They are 800's now, and use the merc pump stup with a electric pump feeding them. No problem with keeping good pressure.


Darrell.

Savy Merc Racing Motor guys, correct me if I am wrong.
Merc used the same mech fuel pump on many motors from the early 454 carb motors up to and including the old SC900.

Darrell, Damn-----a 28 sport cat with twin 800's. You have got to send us some video of that thing roosting some water.

$418 + you need a regulator ( 2 x) :eek:

If you are running Holley carbs you do not need a regulator. I have been using one for years. You do need too rebuild once every 100hrs or so, the valves start to leak, but the parts are only about $60-80. Easily supplies 700-750hp.

I called their 800 no. this morning and was told $390.00, and no need for a regulator. Hhmmm......

I go with the Diamond Performance kepp set up it will be cheaper. I have the same kit on mine since 96 . will no troubles yet pushing 670hp now started at 585hp back in 95.

yep, that's what I'm going to purchase :cool-smiley-027:

Hey Bill, When I talked to CV, I spoke with a techie that when asked about psi, he said something like 8 to 10 lbs. He did recommend for a consistent 7 lbs, use a regulator. The 7 lb. figure came from my carb guy.

FYI-----For those who want to use the CV2630, I have the fitting part numbers that you may need to use this pump.
Just for you Bill, I ordered a set of Jesel Pro shaft rockers for my dyno motor. :D

Jeeeezuz. When I talked to CV the guy told me 7-8 lbs, and no regulator needed. Like talk'n to the phark'n IRS. Ask 10 ?? and ya get 10 answers. No matter though. Think I have the issue solved. I'll give ya a buzz and let you know. Thanks again Dave !!

Cool Richard, those rockers do ROCK :D However, I cheaped out and went with the sportsmen, and we had issues with the stands :mad: Maybe I should'a gone with the pro's :rolleyes: I don't know about set up with the pro's. Ya might want to give Yoda a call and talk about that. He knows a guy somewhat close to you that I believe is quite familiar with them ;)

Lemme know how the dyno session goes !!