View previous topic :: View next topic |
Author |
Message |
TomM Moderator
Joined: Apr 18, 2005 Posts: 458 Location: Rhode Island
|
Posted: Fri Jan 22, 2010 6:09 pm Post subject: adjusting fuel pump pressure |
|
|
Has anyone successfully reduced the output pressure from an M38 fuel pump?
Mine was rebuilt by one of the vendors and runs 7.5 psi out. The carb is spec'd for somewhere 2.5-4 (from memory).
In theory the screws can be loosened and some slack put in the diaphram but has anyone actually done this?
I have some flooding problems which may be vacuum leaks from the manifold to block gasket or may be excess fuel pump pressure.
Tom |
|
Back to top |
|
|
dod03-52 Member
Joined: Nov 14, 2008 Posts: 91 Location: Minnesota
|
Posted: Fri Jan 22, 2010 8:31 pm Post subject: |
|
|
Do you have the "mounting base spacer" between the pump and the block? It is about !/2 inch thick, it lowers the pressure by less action of the diaphram arm on the cam. |
|
Back to top |
|
|
TomM Moderator
Joined: Apr 18, 2005 Posts: 458 Location: Rhode Island
|
Posted: Fri Jan 22, 2010 9:21 pm Post subject: fuel pump |
|
|
Yes,
Spacer, gaskets and original long bolts are installed.
TM |
|
Back to top |
|
|
Stir-stick Member
Joined: Jul 27, 2009 Posts: 37
|
Posted: Fri Jan 22, 2010 9:36 pm Post subject: |
|
|
Did you rebuild the pump ? The diaphram is supposed to be in the down position when tightening the screws.Someone correct me if I'm wrong. I'll double check. Stick |
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16355 Location: Wisconsin
|
|
Back to top |
|
|
TomM Moderator
Joined: Apr 18, 2005 Posts: 458 Location: Rhode Island
|
Posted: Sat Jan 23, 2010 8:18 pm Post subject: pump |
|
|
Got it,
I should be able to get to it this week and will post results.
Thanks
Tom |
|
Back to top |
|
|
|