Can you use an electric fuel pump with a mechanical fuel pump?
Can you use an electric fuel pump with a mechanical fuel pump?
You can run an electric pump with the mechanical but you won’t be able to turn it off and expect the car to still run.
What pushes a mechanical fuel pump?
A mechanical fuel pump is driven by the camshaft , or by a special shaft driven by the crankshaft . As the shaft turns, a cam passes under a pivoted lever and forces it up at one end. When the lever pulls the diaphragm down, it creates suction that draws fuel along the fuel pipe into the pump through a one-way valve .
Do you need mechanical or electric fuel pumps?
In simpler times, carburetors relied on mechanical fuel pumps, and EFI engines required high-pressure electric pumps. Things aren’t so simple anymore because times have definitely changed.
Can a fuel pump be used for priming only?
Yes, the electric pump can be used for priming only. In fact, that’s one of the big advantages of an electric pump – you fill the fuel bowl in the carb BEFORE you start cranking the engine. I’d be a little concerned that the non-running electric pump would pose a restriction to the mechanical pump, however.
What’s the horsepower of a mechanical fuel pump?
Available for small- and big-block Chevy, Ford and Chrysler engines, QFT’s 110 GPH mechanical fuel pumps can support up to 350 hp. Integrated shutoff valves set at 6.5-8 psi eliminate the need for a separate pressure regulator.
Do you need a safety switch for an electric fuel pump?
You really should install a oil pressure safety switch too if you install an electric pump so it won’t feed a fire with engine stopped in event of a wreck. No question a good electric pump in the tank with a safety switch and pressure regulator is the option for high horsepower engines.
When do you need an electric fuel pump?
Upgrading to an electric pump is needed when higher fuel pressures are required, like boosted applications, nitrous, and fuel injection. In some applications, there may even be clearance issues where a mechanical pump cannot be used. Electric pumps offer a larger variety of flow rates and pressure outputs in comparison to mechanical pumps.
Which is better electric or mechanical fuel pump?
Usually, a mechanical pump is preferred over an “aftermarket” electric pump. They tend to be more reliable. However, sometimes that won’t work. In my old ’47 Chevy, the engine I had swapped in had an issue. The crossmember was in the way of the mechanical pump.
Yes, the electric pump can be used for priming only. In fact, that’s one of the big advantages of an electric pump – you fill the fuel bowl in the carb BEFORE you start cranking the engine. I’d be a little concerned that the non-running electric pump would pose a restriction to the mechanical pump, however.
Can a mechanical fuel pump cause hard starting?
Most modern vehicles use electric fuel pumps, but anyone who works on older models and classic cars must be familiar with mechanical fuel pumps. Amateurs may be tempted to blame the fuel pump for problems with drivability and hard starting, but the pros know that the gasoline itself may be at fault.
