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Question: 1981 mechanical fuel pump ???

FactoryC3

Active member
Joined
Oct 14, 2014
Messages
44
Location
USA
Corvette
1981 Black Coupe Red Interior
While working on my fuel system, I found that when I disconnected the fuel outlet (to carb) fitting at the pump, a large volume of fuel ran out until I plugged the line from the tank at the inlet side of the pump. Not just what was in carb line, but solid flow. Is this supposed to happen or should the diaphragm keep fuel from running through to the outlet?
 

dougelam

Well-known member
Joined
Jul 19, 2011
Messages
453
Location
Michigan
Corvette
2002 Roadster
Sounds like the tank was pressurized too me
EVAP plugged maybe?

Sent from my SM-N920P using Tapatalk
 

FactoryC3

Active member
Joined
Oct 14, 2014
Messages
44
Location
USA
Corvette
1981 Black Coupe Red Interior
Not pressurized

Sounds like the tank was pressurized too me
EVAP plugged maybe?

Sent from my SM-N920P using Tapatalk

The tank was not pressurized...gravity flow.
 

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