I have been experiencing occassional stalling/hesitation on takeoff and occassional surging at higher rpm under load.
I pulled the low pressure fuel pump. The manual said to perform 3 tests.
1) Apply 7.1 psi to pump intake; I applied 10 psi and it held 10 psi for a minute.
2) Apply 4.3 psi (8.75 in Hg) negative pressure (vacuum) to intake; I applied 10 inHg and it fell to 7 inHg in a minute
3) Apply 7.1.psi to output side; I applied 10 psi and it fell to 6 psi in a minute and continued to fall
I also pumped the ball while the pump was off the engine but with the fuel lines still hooked up, the ball got hard and I saw no visible sign of gas escaping.
Based on these results, should I get another whole pump? Rebuild this one? If I rebuild this one, which parts are needed for the rebuild. I believe this could explain the bogging issue. Any help is appreciated.
I pulled the low pressure fuel pump. The manual said to perform 3 tests.
1) Apply 7.1 psi to pump intake; I applied 10 psi and it held 10 psi for a minute.
2) Apply 4.3 psi (8.75 in Hg) negative pressure (vacuum) to intake; I applied 10 inHg and it fell to 7 inHg in a minute
3) Apply 7.1.psi to output side; I applied 10 psi and it fell to 6 psi in a minute and continued to fall
I also pumped the ball while the pump was off the engine but with the fuel lines still hooked up, the ball got hard and I saw no visible sign of gas escaping.
Based on these results, should I get another whole pump? Rebuild this one? If I rebuild this one, which parts are needed for the rebuild. I believe this could explain the bogging issue. Any help is appreciated.
