I am aware of the motor requirement calculations, I have all of them here plugged into my equipment.
I also deal with 300+ marine fuel injectors and fuel systems a month in the high season.
The OEM block mounted pump is rated IIRC at 110 gph. A 72 gph free flow pump mounted externally pre filters and on 12v will be lucky to deliver 60% of that.
E10 is not normal gasoline when it comes to older boats, having a carb I would guess this is not a newer model. Holly states for the red and blue..
Originally Posted By: Holley
NOT compatible with alcohol or methanol fuels
These are low pressure pumps for carb applications, they do not state any percentage of ethanol, to assume they mean e10 is okay and others are not is nothing more than an unsubstantiated assumption on your part.
You claim to be an engineer so tell me how the black pump can possibly increase fuel consumption over the red or any other pump? The black is 100% compatible and will only deliver what the engine can use, all it will do is provide more headroom.
We don't know if this is a return system, how much voltage is at the pump, the filter set up, line size, distance from the tank, amount of lift required, etc.
Even if these conditions were marginal the 120gph black will be sufficient for this application with a margin of safety.
Originally Posted By: 1 FMF
the poor guy has a 454 he's got enough trouble with the fuel bill i wouldn't go telling him he "needs" a holley black pump.
I see the e10 problems everyday in marine engines, they make up 80% of my business.
Injectors, lines, fiberglass tank issues, carbs, pump issues are all common.
You cannot compare ethanol in a marine environment to a car.
http://www.fuel-testers.com/e10_gas_not_safe_for_marine_engine.html