Does it matter how long I make the suction line for the fuel pump? I'd like to keep the UAT at the cockpit where I can see it and have the pump in the engine bay - probably 18" (500mm) away.

the shorter the better.
if you have a airbrake installed move it there.
if the fuel lines are to long you will start cavitating fuel.
the turbine is very fast in acceleration and can cause to flame out if it creates a vacuum due to the lenght of the line.s
keep the fue lines to 6mm festo all the way from the tanks to the fuel pump..
before you make your first flight , also test that the acceleration is correct , since you you have now a thrust pipe.
i suggest you set it to about 15 for the first few flights and let the ECU auto calibrate itself to the new tanks and fuel line,s.
it could happen that when you land you will have a high iddle , due to the "learning"curve of the ecu.
what is always do is fly , Trim , Glide
basicly i trim the aircraft , go high , set to iddle and let it settle aq little bit.
after you feel confident land it.......

yes i also had a eurosport.....

I have no airbrake (based on your comments). How long does the auto calibration take - can I get this done on the ground? Fuel here costs almos nothing so I don't mind wasting a bit running it on the ground.

I assume you mean that the acceleration should be set to 15?

you will find that the high idle will occur only in flight.
on the ground it will be always perfect.
anyway before your first flight
start it let it settle to idle.
very slowly move the trottle to max in 10 seconds interval hold it full throttle for about 10 seconds then again in 10 seconds return to idle.
this should solve most of the fine tuning needed.
basicly the more you fly the better the whole feeling will be.

Lengths absolutely matters. But in addition to the thickness it all means nothing without the right performance.

Thanks Sandor.....would it matter if I extended the pump leads - then I could make the suction line shorter and the feed/pressure line longer. With the set up now, I have a long suction and short feed!

Rory

You should always aim to have minimum suction length, the length of the feed after the pump is uncritical. I have been fiddling with my Eurosport fuel setup too and I think I will need longer pump leads , the problem being the distance from the turbine to the rest of the equipment, why couldn't they have designed the thing with a nice convenient top hatch anyway?

John

It is called fuel PUMP not fuel SUCTION. Keep it close to tank #1.
Darryl

john your a bit wrong here.
the merin , nimbus , rhino , ulysses use a 6mm input on the pump and a 4mm on the output.
since our engines accelerate like crazy , the suction side is critical also , so is the output
basicly the shorter the better.(cavitation)
so in Rory,s case he uses 6mm between the tanks and 6mm for air to the tank.
so basicly if he mounts the uat on aft cockpit he should be ok , its about 35-40 cm from the pump.
i also adviced him to move the pump somwhere in between.

Sandor

Not sure of the fuel system dynamics of the Merlin etc. but as Darryl says these are pumps and are better at pumping than sucking. I agree that both sides of the pump the fuel lines should be as short as possible but still maintain that the suction line should be as shorter if you have to make one shorter than the other.

John

If you use the 6mm stiff tubing that is supplied with the UAT there should be no problem with about 18" upstreamfrom the pump. I have been doing that with a Titan and have seen no problems. Down stream after the pump i run the 4mm to the motor and can be any length. I have always installed the small jetcat shut off valve as close to the motor as possible, it helps to keep lines full for the next start and also if you have to remove the motor it holds the fuel in the lines.
V..

your right in all means , however as i mentioned the acceleration can cause a cavitation.
ans some accelerate 4 times slower then a Rhino or Merlin.