Electric Fuel Pump Question
01-24-2014, 12:57 PM
#1
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Electric Fuel Pump Question
I'm getting ready to start working on things other than the engine!!!
I have a question,
I have a 383, 9.4:1 compression with .540 lift camshaft and an RPM Performer air gap, with a 750 holley. I have been told that the Carter acorn style (438110 @ Michigan Motorz) fuel pump would supply this engine and be reliable. I know quite a few people that have run them and never had problems but they're on stock air boats, and non high peformance engines.
Any thoughts? I know this can open up a whole bunch of opinions, but it is winter,,,,,what 'cha got???
Max RPM 5500
I have a question,
I have a 383, 9.4:1 compression with .540 lift camshaft and an RPM Performer air gap, with a 750 holley. I have been told that the Carter acorn style (438110 @ Michigan Motorz) fuel pump would supply this engine and be reliable. I know quite a few people that have run them and never had problems but they're on stock air boats, and non high peformance engines.
Any thoughts? I know this can open up a whole bunch of opinions, but it is winter,,,,,what 'cha got???
Max RPM 5500
Last edited by CC230; 01-24-2014 at 01:01 PM.
01-24-2014, 06:52 PM
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HP x specific fuel consumption average/ fuel weight = 400 X .50 / 6.1 = 32.78gph
Well looking up the performance version of that pump on Summits website, the best one is 100 gph, that answers that! Thanks Cole.
This is from Boating Magazine:
Formula To Estimate Maximum Engine Fuel Consumption
GPH = (specific fuel consumption x HP)/Fuel Specific Weight
Constants Gas Diesel
SFC .50 lb. per HP .40 lb. per HP
FSW 6.1 lb. per gal. 7.2 lb per gal.
300-hp Diesel Engine Example
GPH = (0.4 x 300)/ 7.2 = 105/7.2 = 16.6 GPH
300-hp Gasoline Engine Example
GPH = (0.50 x 300)/ 6.1 = 150/6.1 = 24.5 GPH
Well looking up the performance version of that pump on Summits website, the best one is 100 gph, that answers that! Thanks Cole.
This is from Boating Magazine:
Formula To Estimate Maximum Engine Fuel Consumption
GPH = (specific fuel consumption x HP)/Fuel Specific Weight
Constants Gas Diesel
SFC .50 lb. per HP .40 lb. per HP
FSW 6.1 lb. per gal. 7.2 lb per gal.
300-hp Diesel Engine Example
GPH = (0.4 x 300)/ 7.2 = 105/7.2 = 16.6 GPH
300-hp Gasoline Engine Example
GPH = (0.50 x 300)/ 6.1 = 150/6.1 = 24.5 GPH
Last edited by CC230; 01-24-2014 at 07:32 PM.
01-26-2014, 06:22 AM
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quikie rule of thunb; take a zero off hp and you have gals per hour needed. 400 hp...40 gph. i ran 1 holley red pump for 2 moderate 350's for a couple of weeks. never any fuel delivery issues.
01-27-2014, 12:52 AM
#9
I'm using the stock Merc mechanical pump and VST system on a very similar non-stock EFI motor (377 cid/ 9.45:1 / .545" ) with 42# injectors and it seems to hold up. No lean out issues due to insufficient flow. Having said that I'm not familiar with what the stock (Merc) mechanical pump output is.
01-28-2014, 11:23 AM
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Trash, I wish I could use a mechanical pump, my new block isn't drilled for it. I know I could drill it out with a jig, but i'm kinda liking the idea of getting fuel to the carb sooner VS turning the engine over to get pressure. At least untl it get a few psi of oil pressure anyways.
