Fuel pump recommendations
 

I have a 30' Spectre and am rebuilding engines to NA 548CI which should be aourn 650 to 700hp with 1050 dominators. I was running stock mercury fuel pumps off the sea water pump which are not in the best shape. Has anyone ever had a problem with the cam going out in these?
The supply line to the tank has been change to #10 and the filter is mounted low in the boat.

Should I:
-Buy replacement mercury seawater fuel pumps which would probably be borderline in my application $130
- Buy above with Hardin Marine upgrade kit $130 +$159
- Go with the Mallory electric 140 GPH Marine - $259

If I were to do the Mallory does the regulator they come with allow for a bypass or is there another regulator/fitting or something else involved? Can the bypass be run back between the tank and the filter with a T fitting? I don't think I can get a return line back to the tank.

Re: Fuel pump recommendations
 

I have a 540 n/a that made 650 hp on the dyno and used a weldon 600 flow thru style pump. Weldon said it was good for 800 hp at 9 psi, in a carbed engine. Works great, quiet, draws very low amps.It was a little more expensive at $352 from Kinsler fuel injection, but weldon is one of the best.

Re: Fuel pump recommendations
 

I just rigged up my new 540 with Aeromotives by-pass regulator and pump. I have heard only good things about their system. I also have a mechanical Edelbrock pump bolted to the motor with the required check valve. That way I can cruise on the mechanical pump and click on the electric when I beat on it.

Re: Fuel pump recommendations
 

I have t/na540s and Carter 140 GPH internally regulated mechanical pumps (part# M61045). Flat out 5800 rpms and the pressure never moves (dash mounted guages) :D
Only thing I had to do was tap in small nipples into the vent holes for the overflow tubes :cool:

Re: Fuel pump recommendations
 

Check out CV Products. I have their billet mechanical pumps mounted on my sea pumps. There was a thread about them recently.

Lot easier to install than an electric. The electric will require a relay, pump, wiring, oil pressure cut off switch, bypass regulator with line back to the tank, etc.

Re: Fuel pump recommendations
 

Holley Black

Re: Fuel pump recommendations
 

Beat on it??? Wide open is just optimal cruise speed.

Re: Fuel pump recommendations
 

Take it easy there Dave, not everyone has 1300+ h.p. :crazy:

Re: Fuel pump recommendations
 

I'm running a 540 N.A. EFI, and use an Aeromotive electric pump. It seems to work great. You'd obviously be running lower fuel pressure with your carbs, which wouldn't cause the pump to heat the fuel as much, but motors seem to like cooler fuel temps, especially on startup on those hot days.

I would recommend strongly against teeing your return line to the suction of the pump. Fluid systems are already inherently finnicky when it comes to priming and maintaining suction pressure. It would also rob you of the ability to use your fuel tank as a fuel cooler. I envision your return line draining back through the filter to the tank after shutdown, then next time you start the pump, you'll draw air and a vacuum from the return line through the pump to the rail, then voila, a totally airbound fuel system. Just my $.02

Re: Fuel pump recommendations
 

Got my vote.

Re: Fuel pump recommendations
 

CV products?? web site or contact info??

Re: Fuel pump recommendations
 

Here is a link to CVProducts' site.

http://www.cvproducts.com/cv/


Here are links to previous discussions on pumps.

http://www.offshoreonly.com/forums/s...ad.php?t=92100

http://www.offshoreonly.com/forums/s...ad.php?t=38204

Re: Fuel pump recommendations
 

I like these pumps. Can get them with the USCG vent tube also.
Clay Smith pumps are the original 6 valve pump and flow 140gph.

http://www.hotboatpics.com/pics/data..._chevy-med.JPG

Re: Fuel pump recommendations
 

I looked at my earlier post and that didn't come out right. I meant WOT is the perfect speed in any boat. Whether it's 20mph or 200mph. Faster is better though!

Re: Fuel pump recommendations
 

I have CV products pumps on my seawater pumps with about the same power. I tried some of the other pumps, but none would maintain fuel pressure. The CV is expensive, but with 3 internal valves instead of 1, it will easily supply your engine. It is also a simple bolt on!

Re: Fuel pump recommendations
 

Carter HV bolt it up to the top half of the stock merc pump. Less than $100.00 and run all 1/2 inch lines.

Re: Fuel pump recommendations
 

Good point, just make sure the upper rubber and spring are in good shape. They usually develop rust in that area.

Re: Fuel pump recommendations
 

Just wanted to put my $0.02 in: The electric Holley's work, but they are the loudest poorest built pumps out there. The Mallory is gear-rotor which is quiet and same operation principle as some oil pumps. Mechanical seems good, but the idea of something else flapping back and forth at 5500rpm (actually 1/2 that for fuel pump pushrod off cam lobe) is preventable with something that just spins in a circle like an electric. My vote is 1. Mallory, 2. replace the bottom half of stock with Carter HV as mentioned above. Aeromotive seems cool, but their hour rating is kind of short for expected life.

Re: Fuel pump recommendations
 

I ended up getting the electric Mallory 140 Marine pumps and the Waterproof Painless Wiring kits. I think all I need now is the oil pressure safety switch and I will be good to go. Mallory's instructions say nothing about running a return line on this model pump??? Anybody running them without a return line?

Re: Fuel pump recommendations
 

You don't have to run a return line, pump has built in bypass, just have a good regulator. If you run the mall 110 elect you don't need a reg.

Re: Fuel pump recommendations
 

Made this mod on a friends sea water mounted fuel pump. Works great for 560hp. Plus no wiring/safety switches etc. etc.

Re: Fuel pump recommendations
 

That was my original plan but the rest of my pumps were pretty worn out as well and the guy at the boat shop showed me two pumps that the cam had broke. I'm not sure why but it made me a little nervouse?