gas pump/ fuel meter
Thread Starter
Intermediate
Joined: Jun 2009
Posts: 41
Likes: 0
From: centreville va
gas pump/ fuel meter
Is there any need for a dampener before the fuel meter or a special fuel meter ?
I hooked up a fuel presure meter to the T on the fuel line after the pump.
The needle fluctuates all over at idle and from 0 to 15 in a very fast motion (almost cant see the needle cos it goes too fast) at higher rpms.
bad pump ?
Thanks !
I hooked up a fuel presure meter to the T on the fuel line after the pump.
The needle fluctuates all over at idle and from 0 to 15 in a very fast motion (almost cant see the needle cos it goes too fast) at higher rpms.
bad pump ?
Thanks !
Instructor
Joined: May 2006
Posts: 223
Likes: 1
From: Kennesaw GA
Fuel pressure
Agreed, 15psi might be blowing the needle out of the seat on the carb, but since the fuel pump is a 'surge' type lever pump, you will see pressure going from 0 to max on each cycle. Since the fuel bowl acts like a reservoir, it makes sure the circuits of the carb only see a steady flow of fuel. If you are used to looking at an electric pump, you won't see this fluctuation.
Hope this makes sense.
Shawn
Hope this makes sense.
Shawn
Thread Starter
Intermediate
Joined: Jun 2009
Posts: 41
Likes: 0
From: centreville va
Thread Starter
Intermediate
Joined: Jun 2009
Posts: 41
Likes: 0
From: centreville va
Agreed, 15psi might be blowing the needle out of the seat on the carb, but since the fuel pump is a 'surge' type lever pump, you will see pressure going from 0 to max on each cycle. Since the fuel bowl acts like a reservoir, it makes sure the circuits of the carb only see a steady flow of fuel. If you are used to looking at an electric pump, you won't see this fluctuation.
Hope this makes sense.
Shawn
Hope this makes sense.
Shawn
Drifting
Joined: Oct 2007
Posts: 1,317
Likes: 22
From: Marina CA
Is there any need for a dampener before the fuel meter or a special fuel meter ?
I hooked up a fuel presure meter to the T on the fuel line after the pump.
The needle fluctuates all over at idle and from 0 to 15 in a very fast motion (almost cant see the needle cos it goes too fast) at higher rpms.
bad pump ?
Thanks !
I hooked up a fuel presure meter to the T on the fuel line after the pump.
The needle fluctuates all over at idle and from 0 to 15 in a very fast motion (almost cant see the needle cos it goes too fast) at higher rpms.
bad pump ?
Thanks !
Is your gauge liquid filled? If not you will see the needle flucuations, a liquid filled (glycerine) gauge dampens the needle movement.
Thread Starter
Intermediate
Joined: Jun 2009
Posts: 41
Likes: 0
From: centreville va
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Thread Starter
Intermediate
Joined: Jun 2009
Posts: 41
Likes: 0
From: centreville va
-mech advance all in at 1700 rpm. probably worn springs.this thing looks like it came with the car.
-vibration after 3k rpm, like a bad balanced tire but in any gear at any speed.
-rough idling till 1200 rpms...
BTW i bought a glycerin filled pressure meter, i hope it helps with my insane fluctuation of the current one.