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pbp1 · 05-08-2017, 11:26 AM

225#s per hour required to support 500hp with a Brake Specific Fuel Consumption of .45

One gallon of Gasoline weighs about 6#s.

225#s per hour = 37.5 Gallons per hour, which equals .625 gallons per min.

This is the minimum fuel volume required to support a 500hp engine.

Like someone said above, it is dangerous to free flow fuel so proceed with extreme caution. Make sure there are no sparks or open flames while testing.

But to test the output, don't check the fuel flow straight out of the pump because that will not tell you anything. To test, take the return line off of the fuel cell and check the flow there because that is regulated to your set pressure.

To supply the fuel needs of your engine, the return line should fill a fuel jug up to the 2 gallon mark in about 3mins, 12 seconds (3.2 Mins).

I got this from calculating 2 Gallons divided by .625 Gallons per min = 3.2 mins.

Bear in mind that this is the minimum required fuel flow. If it takes 3 mins and 12 seconds to flow 2 gallons, your flow is way off.

Also, the voltage drop you are seeing when your fuel pump is running is evidence that the pump is going bad! Need to send your pump in for service and replace the filter. Also, make sure that your pre-filter (before the pump) is 100 micron stainless screen and not the 10 micron paper filter. The 10 micron filter must go after the pump.

05-08-2017, 11:26 AM	#6
pbp1 Junior Member Join Date: Mar 2013 Posts: 80 Likes: 12 Liked 27 Times in 6 Posts	Re: Fuel flow 225#s per hour required to support 500hp with a Brake Specific Fuel Consumption of .45 One gallon of Gasoline weighs about 6#s. 225#s per hour = 37.5 Gallons per hour, which equals .625 gallons per min. This is the minimum fuel volume required to support a 500hp engine. Like someone said above, it is dangerous to free flow fuel so proceed with extreme caution. Make sure there are no sparks or open flames while testing. But to test the output, don't check the fuel flow straight out of the pump because that will not tell you anything. To test, take the return line off of the fuel cell and check the flow there because that is regulated to your set pressure. To supply the fuel needs of your engine, the return line should fill a fuel jug up to the 2 gallon mark in about 3mins, 12 seconds (3.2 Mins). I got this from calculating 2 Gallons divided by .625 Gallons per min = 3.2 mins. Bear in mind that this is the minimum required fuel flow. If it takes 3 mins and 12 seconds to flow 2 gallons, your flow is way off. Also, the voltage drop you are seeing when your fuel pump is running is evidence that the pump is going bad! Need to send your pump in for service and replace the filter. Also, make sure that your pre-filter (before the pump) is 100 micron stainless screen and not the 10 micron paper filter. The 10 micron filter must go after the pump.