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73-87 Chevy _ GMC Trucks => Performance => Topic started by: 305chevy c-10 on August 15, 2011, 12:58:01 pm
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does anyone know whats a good GPH on a electric fuel pump for a 383 with a 750 dbl pump carb on vortec heads with rpm air gap intake .would 130 be too much or 98- 110 be enough
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i dont know for sure but i would think thats way to much for a carbed engine now if it was f.i. yeah i could see that. but sgt on here has a 383 he should be able to tell you what he has
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I run the holley red pump, 79 gph 7 psi. works fine for me. i added a pis gauge and didnt need a regulator.
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i dont know for sure but i would think thats way to much for a carbed engine now if it was f.i. yeah i could see that.
Gallons per hour isn't different for an engine with a carb vs. fuel injection at the power levels being discussed here. Cubic inches, RPM's, ect. dictate how much fuel is required. PRESSURE is what needs to be proper for a given system.
You really can't have too much fuel volume...If it's a dead-head system, the pump just by-passes if it doesn't "see" a hole that needs filled. On a return system, you could have not big enough fuel tube to return an abundance of excess fuel, but that's really more of the problem than the GPH of the pump. The less fuel required for the engine, the bigger the return tube needs to be for a pump with "excess" fuel volume &/or pressure. The set-up on my truck with a carb produces approximately 200 GPH...does it need all of it? No, but you can find out you have too little at a given time (shortly after a launch on sticky tires, ect.)
To answer the original question: Any of the mentioned GPH ratings would be fine. When you get into doing "adverse things" with a vehicle...drag racing, autocrossing, boosted engines, ect. things that get inertia, weigh of the fuel, ect. involved, the pressure/volume become much more of a factor & concern than in a vehicle that is used for more "normal" driving.
Grandma in an old Bonneville could drive a car for years with a pump that delivered 2-3 psi & say 20 GPH & may never need anymore than that, it's only when the demand goes up, the pump must be able to support the engine's needs. Hope this Helps, Lorne
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yes ,thanks since i have a 600 and a 750 i'll just see how the 600 will work first .got to check the model # on the carbs to see if they have vac secondary
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yeah i was confused i was thinking psi.
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Lets say its a regular driver that only likes to make the tires smoke every once in a while. Will a stock fuel pump with a Qjet be enough for that 383? or will it hunger for more? ???
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they put qjets on big blocks but do change pumps what volume idk
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a stock pump would be fine on anything daily driven with any kind of carb.
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i have to run an electric pump my cam doesnt have a fuel pump lobe on it ...