Hey all,
This is a follow-up on my original post. A fuel pump tester was sourced and have some data:
1)Fuel volume-at idle the pump produced 24 oz. in 31.25 seconds
2)Fuel pressure-5 PSI at idle, and it kept the 5 PSI after shut down until I grew tired of watching the gauge (approximately 5 minutes)
3)Vacuum- 9 inches of Hg at idle without moving, with engine stopped, pressure dropped 1 inch of Hg per 70 seconds.
The last reading was the only one that caused concern as it was 1 inch Hg lower than the 10 inch Hg threshold for a decent functioning pump. But given my testing elevation of 3300 feet, that number should be corrected to approximately 12 inches of Hg (Add 1 inch HG per every 1000 feet). So it seems the fuel pump passed all of the diagnostic tests. Glad you all got me to learn how to test versus guess!
I also changed out the rather large paper element fuel filter and it looked every bit as fresh as the new one so I don't feel that had much to do with the stalling issue. The T-2 filter bowl also looked surprisingly clean given that it hasn't been removed and cleaned in over 4000 miles.
After all of these tests and replacements, I went for a 20 mile run and the truck ran fine.
Not sure what the issue was with the stalling as I didn't find any "smoking gun".
Paul
