fuel pump size required



fuel pump size required

Postby grumpyvette » February 21st, 2014, 11:03 am

allen wrote: grumpy my original mechanical fuel pump failed on my chevelle, so I removed it, screwed on a block off plate and added a carter electric fuel pump I had sitting on the shelf that looks like this one
http://www.summitracing.com/parts/crt-p74029/overview/
the car runs fine until you accelerate hard, then it breaks up once it hits 2 gear , that to me indicated its running out of fuel, do I need a performance fuel pump rated at 110gph or one rated at 130gph, as I have zero idea what the original mechanical pump was rated at?


theres a great deal of info in the links below, the problem many guys have is in not understanding that they need a return style fuel pressure regulator a decent filter and adequate line sizes once they start boosting power levels well past the original rated power.
a fuel pump might be rated at 110-gph or 130 gph but once you start restricting the intake and exit ports there's a very noticeable drop in the actual effective flow rate, a 130 gallon per hour pump will be needed to flow 55-75 gph, actually reaching the carburetor inlet port,thats required in many cases, once the restrictions and inertial loads in the fuel lines, and filter etc. are calculated, and a return style fuel pressure regulator makes the system pressure and volume far more consistent and dependable, a 3/8" line size is usually adequate up to about 525hp, once you go past that Id strongly advise swapping to 1/2" or AN#8 line size but remember the weak link in the chain, concept, it does you zero good to have 1/2" lines if the interior openings in the adapters, you use on the lines or filter or fuel pump, etc. or the fuel line exiting the fuel tank is a 3/8" or smaller size. and installing a fuel filter that has 3/8" in and out lines thats rated at lets say 60 gph is certainly going to restrict flow regardless of the fuel pump used. I see guys that spend decent cash on a 130 gph fuel pump who then install crappy fuel filters like these, (pictured below) that were never designed for a performance application or hook up a performance engine, they expect to produce 500 plus hp, they built, to the original 5/16" or 3/8" internal fuel line from the tank
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only to experience fuel starvation issues , who act clueless as to the potential cause.
if you expect to maintain a solid 500hp or higher engine output level, your going to find that a 3/8" stock fuel line, fuel filter,fuel tank lines and strainer sock assembly is very likely to cause fuel starvation issues under sustained fuel demands at that power level, your also very likely to find the stock fuel pump , won,t keep up with demand

Image
http://www.summitracing.com/parts/mrg-9748/overview/
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http://www.summitracing.com/parts/sum-g1512/overview/
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you will be amazed at what youll learn reading links[/b]

viewtopic.php?f=55&t=1939

viewtopic.php?f=55&t=5365&p=16067&hilit=inside+fuel+pump#p16067

viewtopic.php?f=55&t=211

viewtopic.php?f=55&t=635
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: fuel pump size required

Postby grumpyvette » May 16th, 2014, 9:13 am

theres plenty of cars on the street that a 140 gph electric fuel pump rated at 7 psi can supply that are feeding carbs that make up to 600 hp, but youll ocasionally have need of a fuel system to feed an injected car that has over 800-1200 hp, and might run e85 which will require a totally different fuel pump that could easily require an AN#10 size fitting and 40 psi at 200 gph or more

http://racepumps.com/applications-roadracing.html

http://www.weldonracing.com/product/76- ... _Pump.html

http://www.apsracingusa.com/content-cat ... ators.html

http://www.asaperformance.net/servlet/t ... uel/Detail

http://www.apsracingusa.com/content-cat ... _tank.html

http://www.summitracing.com/parts/sum-g3137/overview/

http://www.jegs.com/p/Mallory/Mallory-C ... 3/10002/-1
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Site Admin
Site Admin
 
Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida


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