Another Fuel Pressure issue

We have seen similair issues in our RV12 (carburated).  Spoke with Vans about it and it is a known issue.   They did not recommend any changes or alterations.  I understand Rotax has now come out with a litlle stronger fule pump that eliminates the issue but according to Vans Aircraft they did not recommend upgrading unless we just wanted to. 

Our RV 12  has done it on climbout a few times (first time made me make a quick 180 heading for the airport).  We were just falling below the alarm parameters enough to get the alarm.  Leveling off immediately stopped it everytime.

Thanks Dwight, I spoke to another owner who experienced the problem. He was also told it was a known issue. Who knew?  Not I, ?

I’ll continue to monitor the fuel pressure readings while I wait for a response from THe Airplane Factory, when they reopen in January. 

I would guess that the issue is that the fuel tanks are low in the wings and the fuel pump is high on the engine.

Add to that, a high Nose-UP climb and the fuel pump ends up 5 feet above the tanks.

The good news is that even with 1 psi of fuel pressure, there is more flow available to the carbs than they require for full-power operation so power remains nominal.

3 psi gives a very generous reserve flow capacity, but more than 6 psi risks the float valves not being able to close off the fuel and prevent flooding the carbs.

The solution is to install an AUX Electric fuel pump down Low near the tanks to keep the pressure up in the fuel lines as it climbs the hill up to the engine.

A side benefit is that the higher the pressure in the fuel lines, the lowers the chance of developing a vapor lock situation when the ambient temperatures are higher in the summer.

I had a similar issue. Replaced the fuel pressure sender and pressure readings became normal.

Well, for. Several flights the problem seemed to have disappeared...until today. Again pressure on climb out dropped to 1.9 psi, and came back up to 3.6-3.8 psi as I leveled off. This was with the aux pump on. Engine runs fine. 

im a few hours away from an oil,change, at that time I’ll pull and check filters and float bowls. Any other suggestions?