Ames has a high performance fuel pump with a psi of 5.5-6.5 @120 gallons per hour. the stock pumps run at same pressure but @55 GPH. they also have the electronic one with a psi of 4-14 @105 GPH.
when choosing a fuel pump, is the psi more important than the GPH or visa versa? the electronic one is much more expensive. the only difference, other than price and GPH, is the wide range of psi. do performance street/cruiser motors rely on more psi or GPH or both? thanks!!
I prefer GPH over PSI. PSI can be adjusted as needed where volume/demand cannot. If the engine wants or needs more, it will be there and only use what it needs. Too much PSI will blow the gas right passed the needle and seat.
Depending on your application, the modifications necessary to install an electric pump would also add to the cost of the install. Most electric pumps (Holley, MagnaFuel, etc.) would need to have the fuel line cut and installed in the rear. Those types of pumps are a push style and do not pull the gas from the tank very well. They work best in a gravity fed situation. A mechanical pump mounted on the engine is a pull style pump and will pull the gas from the tank. I would personally go with the mechanical at 120 PGH as long as it is a quality pump.
As Sinbad mentioned, it really depends on your application. I don't recall what your app is..?
IMO, both psi & gph are important. High horsepower engines require more gph. And, the pumps ability to maintain steady psi without creating too much pump head pressure. For carb applications @ 4-6psi, you shouldn't need a pressure regulator. The pump that that goes up to 14psi seems odd, it's too high for carbs and too low for FI. However it's probably designed to go with a regulator.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
thanks all for your input and info. ill will more then likely go with the mechanical pump. and for what im building, the high performance variety will suit me just fine.