Fxrtharley
Newbie
Hello, I have had intermittent power issues on my 1990 454 p30 chassis with a tbi. When I first got the truck in 2022 I dropped the tank and changed all of the fuel lines and the filter. The rig ran good but did start to lose power on occasion. Using the process of elimination I started with adding an inline pressure gage between filter and tbi . It seems when the fuel tank is full it runs better and the psi goes from 10 psi to 8 at acceleration.
This weekend was the worst, we were going over some steep and long hills and the rig would go down to 4-5 psi and 40 mph max. Also the tank was probably 1/3 full and the engine bucked a little and was constant 4 psi.
After I filled with fuel, (63 gallons) it ran better but still went from 10 to 8 psi at acceleration.
I did change the fuel cap also but did not help.
I know there are many pieces to the fuel delivery starting with the fuel pump and I certainly do not want to pull the tank again. If there are other things to look for please advise or if you know of an inline fuel pump setup please advise as well.
Also is there a way to to measure the health of the fuel pump without taking out the 80 gallon tank?
Any help would be appreciated. thanks
This weekend was the worst, we were going over some steep and long hills and the rig would go down to 4-5 psi and 40 mph max. Also the tank was probably 1/3 full and the engine bucked a little and was constant 4 psi.
After I filled with fuel, (63 gallons) it ran better but still went from 10 to 8 psi at acceleration.
I did change the fuel cap also but did not help.
I know there are many pieces to the fuel delivery starting with the fuel pump and I certainly do not want to pull the tank again. If there are other things to look for please advise or if you know of an inline fuel pump setup please advise as well.
Also is there a way to to measure the health of the fuel pump without taking out the 80 gallon tank?
Any help would be appreciated. thanks