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Jul 21st, 2025 | | | | Joined: Oct 2006 Posts: 99 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2006 Posts: 99 | Hi, After about a year of my '56 GMC model 150 sitting with a damaged exhaust valve on the 270 small port, I have had the valve job done, got it all together, and when I used an electric pump to prime the carb, the fuel just gushed out the little 3/16" angled venturi? tube at the top of the carb throat. The elec pump (which I have used before with no problem) puts out a little less than 2 psi. Too much? I adjusted the float level to no avail, now I am wondering what my next step is. The carb was rebuilt last June, and it ran for two weeks before I blew up the muffler. (you may remember that) The float works if I hold it up with the cover off. I have the carb on a tray with a long fuel line so no more gas in the engine.
Well, my time went so quickly,
I went lickety-splitly
Out to my ol' 55.
As I pulled away slowly,
Feelin' so holy,
God knows, I was feelin' alive..... Tom Waits, Ol' 55
| | | | | Joined: Oct 2006 Posts: 99 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2006 Posts: 99 | Problem solved- the float was a little cocked so the toe-of the-float float level reading was off. No gushing now. Sometimes the time to write a question here gives the mental space to try again. Maybe the too high float contributed to last years monster backfire.
Dave | | | | | Joined: Nov 2002 Posts: 2,715 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,715 | Problem solved- the float was a little cocked so the toe-of the-float float level reading was off. No gushing now. Sometimes the time to write a question here gives the mental space to try again. Maybe the too high float contributed to last years monster backfire.
Dave In a different lifetime, when I was a computer systems programmer, and had a code problem that just had me totally stumped; I used to call in someone that knew absolutely nothing about programming, and go through the code explaining the code as I went. Generally, it took about 15 minutes or less to find the gremlin. Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
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