When you buy a new pump at the store, they sometimes come with instructions stating that you should not move the arm by hand, as you may push too far and damage the diaphragm. Keep in mind that in use, on the motor, the arm really does not move very far. So me, being the kind that reads the directions after I screwed something up, would always pump the lever by hand with a finger over the inlet and you definitely should feel it suck. did you try that?
Bench test Vacuum on fuel pump
- Thread starter AnthonyG
- Start date
AnthonyG
Well-known member
Cad3 this is post #12
“Question Re: Bench test Vacuum on fuel pump
My bad, loose nut behind the controls. As said never had one act up so never had to test. In worrying about maniac’ing the sheet metal cylindrical perch I did not put enough pressure on the actuator as it moved about 1/2” pretty easy. When I watched the pump rod cycle it didn’t look Look like more than a 1/2 “ stroke. Per 40cpe secured by carefully putting it in a vice wrapped in a towel not to damage & was secure enough to push actuator arm further than before, got good readings both vacuum & pressure on gauge.
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“Question Re: Bench test Vacuum on fuel pump
My bad, loose nut behind the controls. As said never had one act up so never had to test. In worrying about maniac’ing the sheet metal cylindrical perch I did not put enough pressure on the actuator as it moved about 1/2” pretty easy. When I watched the pump rod cycle it didn’t look Look like more than a 1/2 “ stroke. Per 40cpe secured by carefully putting it in a vice wrapped in a towel not to damage & was secure enough to push actuator arm further than before, got good readings both vacuum & pressure on gauge.
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AnthonyG
Well-known member
I believe there might not have been a problem with the pump. Once I realized from tips here on FB that I wasn’t putting enough pressure on the pump arm in initial pump bench test & when I did it showed good vacuum & Pressure on my gauge.the first install that caused me to question the pump was probably the rod not seated on pump arm as Allen suggested. But thinking the bowl wasn’t sealed because I had taken the bowl off & re-installed after in position ( PIA ) to access mounting hardware in cramped quarters. I changed install sequence trying to make it less of a PIA by putting the stand in position first then seeing the rod thru the side mount hole in the stand was able to insure the arm seated in the cylindrical containment seat & was engaged correctly before installing pump mounting hardware.