The small diameter hose that we’ve all been talking about is a fuel pump diaphragm vent hose. It connects from small fuel pump barb to small barb on the upper part of the carburetor. It provides a path for any liquid fuel that escapes the fuel pump in the event of a ruptured fuel pump diaphragm...
I’d be interested in the battery voltage during cranking. In other words let’s say the battery voltage is 12.5 before cranking the engine over. It should be at least 10 volts during cranking. If it drops below that, possibly a battery issue here. Especially since the starter only turns the...
Congratulations on solving the mystery of the fuel pump vent system. One last question: are you sure the clear hoses are gasoline proof? I’ve not seen clear gas resistant hose.
To Buzzsaw, the fitting you show near the bottom of the carburetor is for Manifold Vacuum. You can prove this by feeling suction at the fitting when the engine is idling. It’s not for the vent line that we’re all talking about. It was typically used in cars for supplying engine vacuum to the...
Look at the top of the carburetor for a similar fitting. The fuel pump vent hose will send any fuel that leaks from a defective diagram up to the carburetor instead of into the bilge. Marine fire safety.
What you see is the fuel pump camshaft lobe. It is a part of the camshaft and of course turns at 1/2 engine crankshaft speed. Anyway, here’s what you need to do. Hold the new fuel pump against the mounting surface by hand. It should fit perfectly flat against the machined surface. If it doesn’t...
Disconnecting the battery to make the starter pinion gear unmesh from the flywheel? I’m not seeing how that can affect the tight gears. I’m still believing that the problem can be resolved with the correct starter shim.
You can get shims from a starter rebuild shop, or a Chevy dealer.
Just a 1/16 inch shim may be needed between the starter and the block, for instance. It’s about one inch by four inches. It has bolt holes that correspond to the starter bolt pattern.
So just a thought here. If you suspect the Shift Interruptor Switch try temporarily disabling it. First warm up the engine. Shift into forward. Stay at idle speed. Unplug the connector at the switch. Accelerate to the RPM range where trouble is usually found. Let her rip! See if the issue...
Okay now that the new alternator is all connected let’s do a test. At the large output wire on the alternator test for voltage with the engine off. Use a DVOM. Red to alternator output wire. Black to bare metal on engine. It should read the same as battery voltage. Now with the engine running...
Engine rebuilders use a specialized straightedge. It is as long as the cylinder head. They use a specification to check for total warp from one end to the other end of the head. Then another spec for checking the space in between any cylinder to the next. Same checks are made on the deck surface...
As for the head bolts, if they go into a wet hole ( coolant) they need sealant on the threads. Those going into a dry hole I like to lightly coat with engine oil. Definitely chase the threads in the block with a thread chaser. I’m concerned about the straight edge you used to check for a warped...
My wife and I fish a lot on Lake Huron, out of Alpena MI. When I put the boat in for the first time in the spring I ask for a Radio Check. On Emergency Channel 16. That confirms that all is well. I keep it on whenever we’re out and also check the weather on the WX weather channel. Safety feature...
