Thread: High Fuel Pressure Warning!!!! HELP!!!

Hi All,

There has been a few times recently, When flying, my dynon 180 has displayed "High Fuel Pressure Warning". The meter would read somewhere between 0.35 and 0.38.

There have been no engine problems or anything else resulting to coincide with this warning.

The warning goes away after a while and the meter reads back in the green, High green!!.

What advice would you guys give?? is it a dynon, fuel pressure thing, would you stay grounded until sorted out!!! i've been flying (wheather permitting, which has been totally SH1T)away as everything seems normal other than the warning when it rears its ugly head!!

thanks in advance

neil

Hi Neil,

Sounds like you have a Gremlin messing with you. I hear you have big ones in Ireland.

The max is .4 bar (5.8psi), .35 bar (5psi) to .38 bar (5.5psi) are ok. Just a guess since it is like a switch going on and off it is most likely electrical. What was the reading when you considered it normal? You wouldn't notice an engine change at all whether it was real or an electrical issue at the Dynon. I would check the wires to the fuel pressure sender for tightness, they should not be loose at all. Make them snug. You need to check the ground (my first guess) for the gauge. This can be found on the gauge and at the grounding block inside the instrument panel. Is your fuel pressure sender on top of the engine on the carb cross over tube or down on the side by the battery?

Ny Dynon give .25 bar as regular fuel pressure. Is this considered OK ?

.25 bar (3.6psi) is very normal. That is what mine is. Rotax minimum is 2.2 psi (.15 bar)

Hi Roger,

thanks for coming back.

Yep!! big gremlins indeed, wee call them leprechauns

Cant remember were it is I think its located on the firewall beside the oil can

I'll take a lk the next time im over!! and let you know for sure. why do you ask?

you wrote:You need to check the ground (my first guess) for the gauge. This can be found on the gauge and at the grounding block inside the instrument panel.
I'm not following you on that one, can you explain, Doh!!! where abouts inside the panel??. thanks

Anyway, keep her lit

neil

Hi Neil,

Sounds like your fuel pressure sender is mounted on the firewall next to the battery. The older CT's had them mounted up on the carb cross over tube. Some people thought they were loosing some of the senders due to vibration up on top.
The grounding block is on the firewall in the cockpit side and inside the instrument panel. Take off the instrument panel on the right side (passenger side) and look straight back against the firewall. You will see a bunch of wires there. That is a central point for your ground wires. All and I mean all the screws and bolts that you can get to there need to have a wrench or screwdriver put to them. I bet something is loose. Also check the wires out on the fuel pressure sender itself. They should be nice and snug. If they pull off easily then crimp them down a little to get a better contact.
Then there is always a bad fuel pressure sender problem, but this doesn't seem to be that unless it goes bonkers and stays that way.

Hi Roger,

I know what ur talking about now

I'll check it out 2morrow. Where expecting 70mph winds 2nite
so I'll wanna checkout the hanger etc. Fingers crossed!!

Anyway, i was thinking "doh!!" is high fuel pressure a problem in the ct as the fuel
is gravity fed. Thus making the fuel flow better? Or is it a problem for the fuel lines?

Let know your thoughts

cheers neil

The 5.8 psi fuel pressure max is no problem for the lines or fittings. Over the max can cause the carbs to puke fuel out the vent tubes.

Hmm. Puke all over the place, not good

When I bought my ct it came fitted with a brauniger, so I got a dynon 180 fitted instead .
I done the purchase through Denmark to save some tax Anyway I noticed a few months later when playing arround with the settings in the180 that there is a rotax setting. Well I kept the setting to the orginal setting as I had been recording both tach and hobbs as one night I left the master on and run up a few hrs extra on the hobbs meter 30 hrs to be exact
and if I remember rite the rotax setting only records hobbs?

Well my point is if I'm getting pressure warnings and they're lower than u say ie max .4 and mine being .35-.38 . Do u think this might have something to do with being on the wrong setup on the dynon?

Another thing I noticed was, fuel consumption, and that the dynon was saying that I had less fuel on the guage than wat was actually in the tanks, After a flight.

I haven't bothered changing the setting as it isn't a real problem as I always go by the fuel sight tubes anyway. But I think I will change to the rotax to see if it sorts these issues out I'll record the change in the aircraft logbook. Thinking out loud now!!

Anyway wat do u think

cheers neil

I guess I should have ask to see if you had the Dynon set to the Rotax settings and if you have done all the updates. The Dynon Rotax setting does just do Hobbs and that is what you should be using for your maint times and logbook. Get in the menu and swap it over. The settings on the Rotax menu are different from other aircraft settings.