Fuel pressure rise

hello Mac

First thing is the fuel filter, could be contaminated.  This indeed will cause high fuel pressure.  If it is contamination consider cleaning the fuel pressure regulator also.  You did not say if this when running on both pumps or just one.  The issue is still the same however, check for contamination.  

I doubt that the full or empty state of the tanks has much to do with this.

Cheers

Mac,

If your fuel pressure sender is before the fine filter than a partially clogged filter would raise the fuel pressure.  But the rate of rise seems too fast for a filter loading problem unless you got a bunch of dirty fuel that made it past the coarse filter.  Other possible problems include:

- A defective fuel pressure sender

- A defective (Rotax) fuel pressure regulator

- A problem with the fuel return line, which likely runs through the (double) fuel selector valve.  It would be interesting to know if the problem goes away when you switch tanks, since that also changes the fuel return path respectively. 

I'm troubled by the fact that this happened right after "fuel leaks in both wings" were repaired. Do you know precisely what was done?  

Just thinking....perhaps sealant from the repair has made it from the tank to the filter.  For sure check the internal part of the regulator while you are at it.  

Cheers

Where is the coarse filter located?  This is a 2019 Flight Design Super Sport i.  I see that filter referenced here, but don’t know where to find it.  

I was only using the primary pump.  Normally turn on auxiliary when landing, but didn’t want it to go higher.