Where does the fuel map setting come from?
The fuel map is the electronic fuel injection system’s setting for regulating the air/fuel mix and is created by engineers during construction and tests of an engine. Fuel map is not a peace of paper, but an engine computer sets of settings.
What should fuel pressure be when no Buzz?
Fuel pressure is typically in the 35 to 45 psi range. If your Anti-Theft light is flashing; the anti-theft system is disabling the fuel pump to prevent the engine from starting. Bad fuel pump (Pump should run for a few seconds when ignition key is turned to start, no buzz means no fuel delivery to the engine).
Why did I have to change the fuel pump?
I had to change the pump because it had failed, no pressure or electrical humming. Make sure the fuel injectors are pulsing as oldtimer mentions. Even if the injectors are pulsing it won’t run with only 10 psi fuel pressure. Just curious, do you have a check engine light?
What is the purpose of fuel injection mapping?
Fuel injection mapping really is the process of systematically adjusting the fuel/air ratio at all operating points of the engine at specifics situations. The car user could have one of many goals. For normal user concern could be emissions, fuel economy, or some compromise between balance of performance, emissions and noise.
What happens when you change the fuel pump module?
If no faults are found change the fuel pump module. • If fuel pressure is present then the vehicle may have been incorrectly fuelled with diesel, or there may be a quantity of water in the fuel. Determine this by draining some fuel into a container from the fuel rail Schrader valve, water will form ‘puddles’ at the bottom of the container.
How does a PWM returnless fuel system work?
With the combination of PWM and fuel pressure feedback, a large-volume pump that normally would produce excessive heat during low fuel demand can be slowed down. In effect, the PWM system gives a large pump a dual personality: Slow it down for cruise and minimize heat generation, then speed it up for high fuel demand.
Why does fuel gauge read wrong after fuel pump replaced?
Fuel gauge reads wrong after fuel pump replaced – YouTube If you have a 96 or 97 year gm truck that needs a fuel pump, be sure to order it by the VIN. There is an option for a anti-slosh module that could cause you If you have a 96 or 97 year gm truck that needs a fuel pump, be sure to order it by the VIN.