- Jan 17, 2010
- Reaction score
- Corindi Beach
It depends on the type of pump I imagine. I use a Facet cube solid state electronic pump which delivers 1.5-3 PSI in series with the mechanical pump. Fuel flows through it unimpeded when it is turned off. There is very little wear as the mechanism is a free moving magnet that is pulsed multiple times a second, hence the distinctive brrrrr sound. I also have a similar but larger 4-6 psi one to transfer fuel from the wing tanks into the main tank.I don't have an electric pump so I'm unsure if they normally run in series or parallel with the mechanical pump?
If in series, that is fine as you have flow through the electric pump to the mechanical keeping it cool.
If in parallel, could it be that the reason it is turned off is that lack of flow through it makes it hot?
The mechanical pump is effectively pumping the fuel and therefore the electric is dead heading. Ok for short periods but it will get hot after a period of time.