VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 02-22-2020, 12:50 PM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGG
Posts: 2,796
Default Airflow Performance fuel injection with purge valve

I have the Airflow Performance fuel injection (FM-200) with purge valve and was wondering about what fuel pressure I should see with the purge valve open (flowing). With the engine stopped, mixture full rich, and the electric fuel pump (Andair PX375-TC) on, I don't see a huge change when it's open or closed, about 34 PSI. Same on left and right tanks.

Does this seem reasonable?

I was kind of expecting that the fuel pressure would drop. I unfortunately didn't look at fuel flow numbers, but I'm guessing the reason the fuel pressure remains high is that even though the purge valve is open, the fuel flow through the FM-200 is still quite low.

Thanks for any insights!
__________________
Mickey Coggins
http://rv8.ch
"Hello, world!"
Reply With Quote
  #2  
Old 02-22-2020, 01:45 PM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 9,091
Default

Quote:
Originally Posted by rv8ch View Post
....I'm guessing the reason the fuel pressure remains high is that even though the purge valve is open, the fuel flow through the FM-200 is still quite low.
Works for me.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #3  
Old 02-22-2020, 04:41 PM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGG
Posts: 2,796
Default Thanks

Quote:
Originally Posted by DanH View Post
Works for me.
Thanks Dan.
__________________
Mickey Coggins
http://rv8.ch
"Hello, world!"
Reply With Quote
  #4  
Old 02-22-2020, 11:17 PM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGG
Posts: 2,796
Default purge valve

Quote:
Originally Posted by PilotjohnS View Post
I think the purge valve is setup so that when it is open, there is not a lot of change in fuel pressure with just enough flow to purge. This way, if the valve fails open there will still be fuel pressure for the engine to run.
When you open the valve the engine dies immediately.
__________________
Mickey Coggins
http://rv8.ch
"Hello, world!"
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 08:20 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.