CRG Discussion Forum

Camaro Research Group Discussion => General Discussion => Topic started by: Tinkerr on March 23, 2020, 10:50:01 PM

Title: 1968 396/325 Stock Fuel pump pressure
Post by: Tinkerr on March 23, 2020, 10:50:01 PM

Anybody have any real world fuel pump pressure numbers for a stock pump. I had my motor dynoed today and the pump was only carrying 2.5psi. It was a steady 2.5 but only 2.5. We supplemented with the dyno's electric pump and picked up 5-7 hp above 4800rpms. It would indicate they motor wasn't starving, but seems low. Thanks

Title: Re: 1968 396/325 Stock Fuel pump pressure
Post by: Mike S on March 23, 2020, 11:18:08 PM

 I checked the AMA manual for the Camaro and I see the V-8's (except L78) listed as having a pump pressure of 5.0-6. PSI

Title: Re: 1968 396/325 Stock Fuel pump pressure
Post by: Tinkerr on March 30, 2020, 11:37:51 PM

Looks like I'm buying a new fuel pump to replace the one that doesn't have any run time on it. Maybe Ethanol impacted it just sitting around. Thanks for your reply Mike

Title: Re: 1968 396/325 Stock Fuel pump pressure
Post by: lynnbilodeau on April 13, 2020, 03:06:43 AM

Beware that almost every aftermarket fuel pump made recently has too stiff a spring and therefore too much pressure.   Over 7 psi and you are asking for trouble.

Invest in an inline fuel pressure gauge and check it before you run it.    I had three in a row register over 10 psi.

Title: Re: 1968 396/325 Stock Fuel pump pressure
Post by: adjudimo on April 13, 2020, 05:17:47 AM

The 396/325 I took out of my 67 stayed around 5.5 lb pressure when it was in the Camaro. I have heard others in my area also complain about the newer pumps running high pressure as stated above.