| My IO360 powered Lancair 360 would run very roughly on taxi following a flight or a restart prior to the engine having time to cool down. As we have moved into the hotter time of the year the issue had become increasingly worse. All of my fuel lines are double insulated as an attempt to keep them from being exposed to heat. My gascolator is also insulated. When I described this condition on LML I received many responses with the lion share suggesting that I try to provide some cooling to my engine driven fuel pump and gascolator. One post suggested I order a cooling shroud for my engine driven pump from Spruce. I installed the pump shroud, punched a 1" hole in the rear pilot side metal baffling, installed a 1" flange and ran 1" scat to the shroud. That simple change proved to eliminate my engine surge.
Clearly the fuel in the engine driven pump was getting hot and vaporizing introducing air into the system. By providing some cool air to the pump the temperature was reduced enough to eliminate that vaporization.
I hope this helps.
Berni On Monday, June 25, 2012, Christian Meier wrote:
Berni,
Could you please describe what you changed to cure your engine problems.
thank you,
Christian
Am 21.06.2012 um 19:07 schrieb Berni Breen:
> Last week I received the fuel pump cooling shroud I had ordered from Aircraft Spruce following a recommendation from a fellow LMLer. Following installation and testing I can confirm that this simple, inexpensive change completely eliminated my engine surge issues. I want to sincerely thank all those that responded to my call for help as once again I was able to fix a problem as a direct result of input from this list.
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