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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Apr 2013 Posts: 67 Shop Shark | | Shop Shark Joined: Apr 2013 Posts: 67 | Hi-
Anybody know off hand the fuel pump flow rate for
these trucks:
I have a '63 with a 230 ci engine.
Ron
Colonie NY | | | | | Joined: Apr 2014 Posts: 924 Shop Shark | | Shop Shark Joined: Apr 2014 Posts: 924 | Generally speaking, 3.5 to 4.5 pounds of fuel pressure is good...
I have never measured a volumetric flow rate (in this situation), but what is the exact predicament you're in?
Brad
Wrench Fetcher, PhD | | | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | To add to my kemosabe: Stock= 20GPH @ 4 PSI. Visual= fills up a water bottle faster than the lizard snatches the fly.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
| | | | | Joined: Feb 2004 Posts: 29,767 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,767 | The classic volume test we used for a lot of years was a flow rate of a minimum of 1 pint in 30 seconds at idle speed. Any engine that won't run for 30 seconds on the gas in the float bowl has a lot more problems than fuel flow rate. If the pump fails a flow test, check output pressure and input vacuum. 3-5 PSI on the output side is about right, and the pump should produce 10 inches of vacuum minimum on the input side. Both pressure and vacuum should remain steady for a few seconds after engine shutdown. This procedure checks the condition of the diaphragm, and the input and output check valves, as well as the operating spring condition. The pump cam does not develop the output- - - -the spring controls the output pressure.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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