Fuel Pump flow test results!
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Lead Driver
Joined: Apr 2001
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From: Texas
Fuel Pump flow test results!
Well ,I finally tested the flow of the electric fuel pump. Flowing to a gas can slightly higher than the inlet to the carb, flowing through the entire fuel system, except teh last few inches of the dual inlet splitter at the carb, we calculated a flow rate of about 72GPH? The pump is rate at 140GPH, but I'm sure thats a free-flow with no filters or plumbing hindering things.
Whaddaya think? Is that enough. Seems like it ought to be plenty. My Dad, thought I should be able to run a diesel locomotive with that kind of flow (he was helping to make sure I didn't blow myself up:-)
I'm installing a new Barry Grant fuel presure gauge now. the old autozone cheapie fell apart.
Whaddaya think? Is that enough. Seems like it ought to be plenty. My Dad, thought I should be able to run a diesel locomotive with that kind of flow (he was helping to make sure I didn't blow myself up:-)
I'm installing a new Barry Grant fuel presure gauge now. the old autozone cheapie fell apart.
Lead Driver
Joined: Jan 2003
Posts: 9,893
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From: Ohio
At what size line is that rate tested at?? If you have 3/8" and it's rated with 1/2" then the gph is going to be low. I've never really tested a pump before, and I'm curious to find out what they actually use to test/rate them. I wonder if that is no line at all, just free flow out the side of pump?
I would say that even 72 gph would be sufficient to run on. The big way to confirm would be watch fuel pressure. If it fluctuates at all during a run then you know it's not keeping up.
I run a Mallory 140 on my race car. It has 1/2" line to regulator and splits to -6an braided to the carbs. I also have 1/2" return line. I think the return system reliefs alot of strain on the pump.
I would say that even 72 gph would be sufficient to run on. The big way to confirm would be watch fuel pressure. If it fluctuates at all during a run then you know it's not keeping up.
I run a Mallory 140 on my race car. It has 1/2" line to regulator and splits to -6an braided to the carbs. I also have 1/2" return line. I think the return system reliefs alot of strain on the pump.
Posting Guru
Joined: Aug 2001
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From: Evanston, WY
Using a BSFC of .55lbs/hr, you should be able to support around 785HP with that flow rate. I typically just move the decimal point to get a conservative rough estimate of HP per fuel flow. Using that method, 72gph = 720hp. By contrast that would be .60lbs/hr BSFC, which should be more than enough.
Did you reroute your lines?
-Scouder
Did you reroute your lines?
-Scouder
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Lead Driver
Joined: Apr 2001
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From: Texas
rerouting, in progress! Had to stop for a short nap and to let my cordless battery charge. Now, to drill a hole in the bed for the plumbing to drop due south coming out of the tank...
I really wish that electric fuel pressure gauge came with the sending unit. I can't believe a $60 gauge needs $50 sending unit....
back to wrenching....
I really wish that electric fuel pressure gauge came with the sending unit. I can't believe a $60 gauge needs $50 sending unit....
back to wrenching....
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Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
Well, I got it replumbed. I took out about 3 extra feet of plumbing and I got gravity working for me strainght out of the tank. plumbing looks about as direct as I can get it considering the truck was not setup for such plumbing and a bulky dual exhaust system.
I also installed the Barry Grant analog gauge for fuel pressure under the hood. I think it's probably more accurate and easier to read.
So far, no leaks! But, doesn't look like the weather is going to cooperate for a track trip. ;-( Oh well, I really wanted to have the electric fuel pressure gauge functional anyway.
I also installed the Barry Grant analog gauge for fuel pressure under the hood. I think it's probably more accurate and easier to read.
So far, no leaks! But, doesn't look like the weather is going to cooperate for a track trip. ;-( Oh well, I really wanted to have the electric fuel pressure gauge functional anyway.
Posting Guru
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From: Evanston, WY
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Lead Driver
Joined: Apr 2001
Posts: 6,175
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From: Texas
I put up some pics of the fuel cell, and the new routing...
http://www.thedreyerfamily.com/69f25...0/fuelcell.htm
now, I gotta figure out where to put all of these gauges...
http://www.thedreyerfamily.com/69f25...0/fuelcell.htm
now, I gotta figure out where to put all of these gauges...
Last edited by gtex; Jan 13, 2005 at 06:37 PM.
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FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
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From: Smith Mountain Lake, VA
Well Greg , Not to confuse you or me.. I just ran it on the EA3..and at my build say 750HP.. it would use at full throttle 415gph..with that said.. 75% of that would be 500fwhp at 311gph... And at 500hp it would take a 39.06lbs/hr Injector..
Just my .02 cent...I'll take the change!! LOL!!
Russ
Just my .02 cent...I'll take the change!! LOL!!
Russ
Posting Guru
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From: Evanston, WY
Russ, you arent sampling the moonshine again are you? 415gph at .55lbs/HP/hr BSFC would yield over 4,500 HP! I think you meant 415 POUNDS per hour. 
Don't get Greg thinking too much, or the next thing He'll have in his truck is a Keith Black nitro burner!
-Scouder
Don't get Greg thinking too much, or the next thing He'll have in his truck is a Keith Black nitro burner!
-Scouder
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Originally Posted by Scouder
Russ, you arent sampling the moonshine again are you? 415gph at .55lbs/HP/hr BSFC would yield over 4,500 HP! I think you meant 415 POUNDS per hour.
Don't get Greg thinking too much, or the next thing He'll have in his truck is a Keith Black nitro burner!
-Scouder
Don't get Greg thinking too much, or the next thing He'll have in his truck is a Keith Black nitro burner!
-Scouder
Russ
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