rocketman-RCU

My Feedback: (73)

I have a JetCat P-120 fuel pump that won't start at the .250 start-up voltage. Even when I increse the voltage to .450 volts it won't start. If I manually increase the voltage to 2.5 volts it finally runs. Does the pump need to be replaced? Can I replace the motor?

afterburner chuck

replace the pump its cheap insuranace the pumps do go bad and do cause flame out and hung starts

igoren

My Feedback: (23)

Hi, before you change your pump ,check the connection of the wires to the pump. you may need to re solder the wires ( loose connection , and not all the st rend are connected ) this will affect the starting ,running and so forth of the voltages .
let me know your findings,
regards,
Isaac

Helijet

If the pump has not been run for a while or is new you may have to break it in. Some pumps can be sticky initially. This is not unusual for Hausel pumps. The procedure is to run the pump at around 4 - 5 volts ( do not exceed 5 volts ) for about 4 - 5 minutes then in reverse for 4 - 5 minutes. Generally this is all that is required and you should be good to go.

acw

My Feedback: (1)

Also, check for obstructions in the kero lines.

BaldEagel

I had a similar problem wich was traced to the wire connections to the brush's, I eventually soldered the wires directly to the brush holders inside the rear casing, gave the wires more support and cured the problems I had, I did put a thread on here somewhere, but no idea where, do a search you may find it.

Mike
371

EDIT: found a link: http://www.rcuniverse.com/forum/m_9786876/tm.htm

ww2birds

My Feedback: (14)

Seems like someone ought to be working on using a brushless motor for jet fuel pumps .. not only because they are so much more reliable than DC motors (no brushes) but also because the ECU can command a specific RPM and know that the motor will turn at precisely this rate .. seems like it would make the whole system much better.

Dave

Vincent

My Feedback: (61)

Even more reason since the addition of kero start where the pump motor needs to spin very slowly during the start sequence. Sometimes after one of my jets has been sitting for a few months the pump motor needs a test prime or two to get it moving during the first start of the day.

V..

BaldEagel

Good idea, but thinking about this the ESC for brushless motors are vastly different to brushed motors, so that would mean updated hardware and software for the ECU, a lot of trouble for what is not after all a major problem with most pumps supplied by the manufactures.

Mike