IO-540 Fuel Pump Question

[JDanno]

on the engine driven fuel pump there is a threaded opening on the side that is mid way on the side of the housing. On the other IO-540s I've looked at, they have also left the port open. What's the purpose of it?? Inquiring minds want to know! Thanks, Dan

 

[Mike S]

Fuel drain in case the diaphragm ruptures, keeps fuel out of the crankcase were it will contaminate the oil.

Put a short length of alum line on it, point it down and away from the exhaust pipes.

See section FF4, pages 1 and 2.

 

[cajunwings]

Pump Drain

It also needs a hose on it to get the fuel out of the cowl in case a diaphragm ruptures. Most setups have a 1/4" rubber fuel hose sticking out the bottom cowl, usually near the firewall away from the exhaust.

Don B

RV 9 Rebuild in Progress

 

[JDanno]

Great thanks guys!!

 

[Wayne Gillispie]

I used aluminum and it cracked at sleeve after 120 hrs. Went back with plastic.