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Old 16-04-2006, 11:15 AM   #1
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Country: Norway
Location: Lillesand
Occupation: Director
Boat make: Phantom 25
Engines: 2 x Merc 2.5 EFI SS
Cruising area: Southern Norway

Join Date: Apr 2004
Location: Lillesand
Posts: 58
Fuel pumps for Merc 2.5 EFI SS



I will use a surge tank set up for my 2 Merc 2.5 EFI SS engines. What kind of fuel pumps are recommended to use?

With my PM 300 SVS I used a Holley pump feeding the engine's own Mercury fuel pump. Since I will use surge tanks, I presume I have to use two different kind of fuel pumps?

Starting rigging next week. Looking forward to sun and ocean swells. Its been one of the hardest winters down here since 1968...

Cheeeers, Toffen G
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Old 23-04-2006, 09:07 AM   #2
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Country: netherlands
Location: Mijdrecht/holland
Occupation: truck repair
Interests: fast boats/porches
Boat name: bernico cat
Boat make: bernico 26 cat 2x 2,5,s
Engines: merc,s 2,5 EFI,s
Cruising area: ijselmeer

Join Date: Dec 2005
Location: Mijdrecht/holland
Posts: 382
To feed the surgetank you want low pressure pumps with a large volume ,and if using one fuel tank you can use 1 bigger low press high volume pump,such as a Holley red electric ,I believe these are flowing 100 gallons an hour ( free flow)
if you let these pumps make pressure, the amount of fuel flow drops hard down .
But in a surge tank these will work fine ,as the press would be very low.
Be sure the overflow /overfill from the surge tank is big enough to flow the fuel back to the tank ,to keep pressure low.
Your engines need 28 gallons an hour each at full throttle, I assume these are 260/280 BHP ?
As for the high press pumps to feed your 2,5 ,s use Bosch motorsport pumps ,these are the bigger/fatter pumps that flow a large amount of fuel.
They should have provisions to screw hose adapters into the housing ,for using 10 mm hose at pressure side.
Use the return fuel from the engines to feed the surge tank also.
And use a fuse between the positive to the fuel pumps

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