1976 Johnson 70hp will only run low rpm after warming up.

[Casey J Pieretti]

Update, rebuilt the fuel pump and found the vacuum line to be very loose and definitely leaking. The diaphram was very stretched and loose. There was no vibration gasket for mounting on the block. Waiting for the wind to die down for a test run.

 

[Casey J Pieretti]

Rebuilt fuel pump, was not leaking but the bladder was very stretched. The vacuum line was in sorry shape and definitely leaking.
Hoping to run this weekend.

 

[racerone]

Actually the pump operates with crankcase pressure , not vacuum.

 

[racerone]

deleted

 

[Casey J Pieretti]

Actually the pump operates with crankcase pressure , not vacuum.

Ok, the hose from crankcase was loose.