PV9685

Edit: I meant to type "Carter" into the subject.. oops.

Anyone have any experiences with pumps like their 4600HP or 4594? All I seem to come across is info regarding the 4070. The issue is that I need to buy a pump and the 4070 is rated at 4-6PSI by internal bypass. The other pumps I mentioned list 6-8PSI.. but the 4600 kicks up GPH from 72 to 100.

Right now I don't need the extra GPH or the higher pressure - but it seems foolish to under-buy when the 4600 is $20 more.

Right now I'm running an 89 TPI 305 converted to a 600CFM vac. secondary Holley card, Weiand 7546 Intake, stock heads and block... and headers going on in a few weeks. I also have some new EQ Vortec heads with 1.94/1.50 that will be going on in a few months and 1.6 roller rockers. Down the road in a few years I will upgrade to a 350 block. (Probably a stock vortec truck block with a cam swap)

So perhaps I won't need 100GPH free flow? It just seems like the 4600 may be a better option but I don't want to throw in a regulator if it's an unneeded part.. simply restricting volume.

five7kid

iTrader: (14)

Fixed the subject line for you. Want the "Tight now" fixed???

I don't have any direct experience with Carter pumps (at least not in the last 30 years). I wouldn't worry about a reg restricting volume, as long as you pick an appropriate reg.

PV9685

hahaha! My head is in the clouds today I've been doing a lot with the car in the last few days..

About the regulator - that's just the problem, I am on a budget and I wouldn't be getting a good regulator. So, I may as well try to squeeze by without one for now; rather than getting some cheapo $20 regulator.

five7kid

iTrader: (14)

The basic $30 Holley 12-803 dead head regulator fed my 400 HP 396 plus a 100 shot without problems. That was with E85, to boot (even more volume required than gasoline).

PV9685

Well, some of my concern with the addition of more stuff on the fuel line was that I may be going with the 72GPH pump and I don't know what it's flow is under pressure (72 is free). So I figure I will reach the limit of the pump more quickly if there are more devices/fittings on the fuel system.

It's interesting how expensive some of the better regulators are considering how simple many of them are designed.

five7kid

iTrader: (14)

The Holley reg is simple and effective, as long as it is okay to dead head the pump you're using.

The more complicated and expensive regs are typically the return style. But, they really don't have to be too complicated. The LS1 Corvette fuel pressure regulation is a relief valve built into the fuel filter - you basically get a new fuel pressure reg every time you change the fuel filter (of course, the fuel filter costs a little more than a "regular" filter). Obviously, it doesn't have to be that complicated.

Now, if only someone made a fuel filter with a 6 psi relief valve in it. . .

PV9685

After some searching around the internet... I have not come across much information. From what I can find the Carter electric pumps seem a bit more reliable than Holley electric fuel pumps - though people REALLY seem to like OE ACDelco and Walbro pumps in terms of reliability. (Funny considering I've seen a lot of in tank AC pumps die, of course they are like 12 years old when they do..)

The one thing that made me choose the 6-8PSI Carter over the 4-6 PSI model was this: Holley's installation manual for the 4150/4160 series carbs lists a minimum of 5 PSI and a maximum of 7.5PSI - though common belief seems to be about 7PSI max and I don't know the minimum that people often use. From what I have read the Carter 4070 4-6 PSI pump actually tops out at 5.75 PSI. I would rather err on the side of a pump that may be a hair too high than fall below 5 PSI.

I decided not to choose the 4600HP pump due to the fact that the Carter 4594 (72 GPH 6-8PSI) costs 26% less. Of course since I saved 26 percent I clicked add to cart on a set of Hedman 68460 Headers - I know they aren't the best but heck, they beat the crusty old manifolds! Next I must figure out my exhaust options. (Something simple like straight pipes, small mufflers and turndowns... on the cheap! not sure if 2.5 or 3 inch is the way to go though)