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Fuel Pump / System
The motor will be a street driven ( :3DSMILE: spirited), single carb, 600-650 HP 482 C.I. KC Pond FE.
Can I use a mechanical, or do I need an electric? Thanks! |
You don't need much fuel pressure....7-8 psi. You can use either one. I chose to use a Holley 7psi electric pump and put a block off plate on the engine. I like the sound of an electric pump myself.
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It's either a 108 or 801.
It's called the holley red. That would be the minimum one to use. You might want to up the system a bit with a return line and regulator. Then you might want to shop a 5 to 15 PSI unit. |
Any good mechanical pump will be fine. Holley, Carter, Edelbrock, etc.
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I went with Carter and Holley (blue). Seems like there are plenty of good choices; however, it was strongly recommended to me to make sure that I had sufficient fuel line capacity. I ungraded the original AN-6 line to parallel AN-8 lines. Drive around on the mechanical and flip on the electric (engaging both to feed) when the play begins...
I decided to follow the cautious route as I didn't want a chance to lean out the motor. Scott |
For the power you are producing and the application you qoute I would consider something like, for example from Aeromotive, this system as a minimum.
12303 fuel filter to a 11203 pump to 13301 bypass reg to the carb and tank. DO leave the float bowl filters in. -6 and 3/8" line will be fine. Do not run braided line all the way to or from the tank, only where required. Do not use 90 degree fittings unless you have to and if so use the 'full flow' type of fittings. This will be fine for 'spirited' street driving and the occasional trip down the 1/4. If you are going racing, check back! Rick |
When I looked at the specs on the Holley Red pump, I became nervous. The Holley site has curves of flow vs pressure. Those 650 HP engines can be fuel hogs especally if you get on it. Instead of putting on a regulator and running a return line, I decided to go the cheap route and add a mech pump. My system has the Holley Red feeding a Carter mechanical. The Carter specs appear to be up to the task of the engine, but since the Holley was already installed I didn't see a reason not to use it.
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Lots of great info! Thanks Guys! :3DSMILE:
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I ran a Holley Red unit in the Kirkham for about a year. No problems with it, but I got tired of the sound it made....like grinding up a bag of rocks. Seems like the older it got, the louder it got.
Replaced it with a Mallory Comp 110 series. Delivers a smooth 7 pounds of pressure w/o a regulator, and much quieter than the Holley...On the car now about two years, and highly recommended. Whatever your choice, run a mech pump also, as Dreamer sez! Bud:JEKYLHYDE :JEKYLHYDE :JEKYLHYDE |
Ok, so how would I plumb to run both mech and electric??
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Quote:
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Output from electric feeds input to the mechanical. Apparently, mechanical will work (pulls fuel through the electric) with or without it operating, but I would think its better to have both working at the same time. I actually installed a pre-filter before the electric pump and a filter after the mechanical.
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How's this sound,....
From the tank, thru a course filter, thru the electric pump, thru the mechanical pump, thru a fine filter, into the front of the fuel log, feed the carb with tees, out the back of the fuel log, thru the regulater, into the return line back to the tank. Sound about right? |
Burgs, sounds right to me. Some put a check valve in there somewhere, but the Holley Red has one internally.
Joe |
Burgs,
I have the near identical setup as Dreamer. Forget all the plumbing aft of the fuel log, just add a pressure gauge there and you'll see a steady 7-7 1/2 lbs at idle and at least 6 at 5000. Engine goes to 700 with NO fuel starvation,but my displacement is 427 as opposed to your 482. I use the Fram HPG at the electric and no other after. Been perfect nearly ten years with annual filter changes. The real benefit to the pair of pumps is you will have much easier cold weather starts [Michigan] priming with the electric, but run both at all times. Just my experience, |
Oops,
One more zero makes 7000. Sorry, |
Yea, no need for regulator and return line. That is why I went with adding the mechanical. The both should run at about 7 psi. If I had gone with a regulator and return line, I would have just gotten another (more capable) electric pump. Not only was it cheaper to just add a mechanical, it was easier too. We have a couple guys running this set up here.
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The Hurricane does not come with an electric pump, and the KC does not come with a mechanical and said it needs an electric, sooo,... I will need to buy an electric anyways.
The Holley blue comes with a regulator. Hurricane will run the return line at the same time as the supply so that's simple. The Aeromotive site has alot of info and also looks good. Any reason not to leave out the the mechanical pump? |
Burgs
The only problem, IMO, with running the electric thru the mechanical, is in the event the diaphram ruptures in the mechanical, the electric will continue to pump and fill the engine block with fuel in a matter of minutes. It doesn't happen very often, but it is just a thin piece of rubber. It is nice though to have the backup in case of the electric failing. In my 496 KC, I'm running the Aeromotive 11203 pump with a 13301 regulator set at 7 psi with a return line (3/8' SS and -8 an where needed). So far no problem with fuel delivery, but I haven't really pulled it very hard yet. There is a pic of the setup in my gallery if interested. Brad W. |
Hey Burgs, if I was in your shoes I would have bought the Aeromotive "Hot Rod" pump (I forget the model, but their ads say its ideal for that application) and the associated regulator. I would get the Holley Black over the Blue, but the reason for both is I already spent bucks on the engine, so a little extra on the pump for insurance wouldn't hurt. I would forget the mechanical if I had a good electric pump. Keith thought the Holley Red was marginal at best.
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