Matronics Email Lists :: View topic - Mechanical Fuel Pump Troubleshooting

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Mechanical Fuel Pump Troubleshooting

Matronics Email Lists Forum Index -> RV-List

View previous topic :: View next topic

Author Message

udog1(at)earthlink.net
Guest

Posted: Sun Jan 20, 2008 1:49 pm Post subject: Mechanical Fuel Pump Troubleshooting

I am attempting to start an O-360 engine on an RV-4  for the first time since installation.  The engine has been previously run  on a test stand with no problems.  The airplane has a Facet electric boost  pump (per Vans blueprints) and the stock Lycoming mechanical fuel pump and MA5  carb.  I can not obain any fuel pressure or fuel flow through the  mechanical pump using only the boost pump.  The boost pump provides  adequate pressure and flow at the mechanical pump inlet fitting but there is  only a trickle of fuel flow through the pump.  What possible mechanical  pump failure mode would prevent the boost pump from supplying the engine?   I had to replace the fuel pump vent fitting - could a blocked fuel pump vent  prevent flow through the pump?  Any other troubleshooting ideas before I go  through the pain of removing the pump - very difficult on an RV-4!

  

 Thanks for any helpful ideas

 Rob

    [quote][b]

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV-List

vft(at)aol.com
Guest

Posted: Sun Jan 20, 2008 9:13 pm Post subject: Mechanical Fuel Pump Troubleshooting

Rob,

 

 There are two check valves in the pump. One each on the inlet and outlet. You should be able to blow through the inlet side but not the other way. It's possible one or both are stuck. 

 

   Danny Melnik

 F1 N14ZM

 Rocket Factory

 Melbourne, FL

 

 

 --

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV-List

Display posts from previous:

	Matronics Email Lists Forum Index -> RV-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum