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My plane has a Dukes pump mounted on the fire wall and then an engine driven pump to give the 20 to 25 psi needed for the fuel injection. I do not have a header tank so the pumps pull directly from the wing tanks throuch a selector valve.
The problem I have is when things get hot. The Dukes will not pump out the vapor so on hot starts I do not use it and depend on the engine driven pump to pull out the vapor until enought cool fuel is available to get the engine to run. One cooler fuel is running into the Dukes pump I can use it to help get the engine running smooth.
I have considered mounting a "Facet" pump in the wheel well against the rear spar where the fuel line runs. I would connect it to a push button on the stick and use it to help bring cool fuel into the system on hot starts. It would normally not be used.
In your case I would mount the pumps in the wheel well against the rear spar. Lots to room and easy to get to. If you are using fuel injection I would consider a way to take the ouput drectly from the "Facet" to the boost pump for hot starts if the boost pump is in the engine compartment. Another option would be a third Facet that pumps from the header to the boost. It would only be used on hot starts to purge ot the vapor and give the boost pump liquid fuel.
There are lots of ways to solve the problem. This is juot one suggeation.
Ray Gardner
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