Fine Tuning Your Carburetor

Fine Tuning Your Carburetor

Although I have tuned countless carburetors over the years by “ear”, I decided I wanted to make sure I had tuned my trucks new carburetor to be as efficient as possible. Especially since my hearing is NOTHING like it used to be!

Tuning Carburetor With Vacuum Gauge

Tuning Carburetor With Vacuum Gauge

The next step in carburetor tuning is via a halfway decent vacuum gauge. You connect the gauge to a vacuum source – in this case I connected to the line right off the intake manifold that runs to the vacuum advance unit on the distributor. I immediately saw a wobbly reading of approximately 16.5 inches of vacuum. After adjusting the mixture, it rose to a little over 18 (you want to see between 18-20 or so) and was pretty steady. Also, the periodic “puff” in the exhaust decreased, which was good.

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Winter Storage

Winter Storage

So it’s finally time to put Cornelius away for the winter. I am fortunate enough to have an extra 10 feet at the front of my garage where the truck can be kept and still allow two vehicles to park normally. And while tight, there is also enough room to get at most everything so that I can pull a part or two off for restoration over the winter.

Cornelius in Winter Storage

Cornelius in Winter Storage

I’ve put together a winter storage to-do list that I have compiled from a few sources, and this is pretty much what I’ve followed for Cornelius. Have any thoughts or additions?

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Test Drive

Test Drive

Well the weather finally cleared this past Thanksgiving weekend and I managed to get Cornelius out for a proper test drive. The skies were sunny and blue, and the temperature was a rare 64 degrees in late November! Susan joined me for no less than 25 miles of country driving, at low speeds and high, up hill and down. Cornelius felt smooth and powerful the entire trip, and the idle stayed smooth and even. Acceleration was smooth, with no hiccups or power fade.

Cornelius Out for Test Drive - November 24, 2017

Cornelius Out for Test Drive – November 24, 2017

So after several weeks of tinkering with the stumbling issue, I am happy to report that the fuel supply was the primary problem (we also solved a vacuum issue which also helped immensely – read older posts to see details) and that it has been solved. It was a VERY enjoyable afternoon.

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New Fuel Line

New Fuel Line

So as I had noted in my last post, I felt that the main section of fuel line had to be replaced. I ordered a twenty-foot coil of 3/8″ copper-nickel fuel line and used my brake flare kit to set up a double-flare on each end. This line replaced what had previously been three sections of different types of tubing extending from the gas tank to the engine bay, each joined by rubber tubing and hose clamps.

Tubing Straightening Tool

Tubing Straightening Tool

The new line replaces all of that – the only line left in place was a nicely bent section extending from the driver’s side of the engine bay to the passenger side, where it connected to the fuel pump. From the fuel pump there is one more section of line extending to the fuel filter, which is then directly connected to the carburetor. I used an air compressor to blow out the lines I retained after they were drained of fuel.

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Stumbling Along

Stumbling Along

Within a week or so after replacing the differential oil, Cornelius started to complain a little when going uphill. This was in the form of stumbling when the accelerator was applied.

Durex Fuel Filter Prior to Cleaning

Durex Fuel Filter Prior to Cleaning

My first steps were to check the fuel system and to clean the fuel filters in both the Durex Fuel Filter itself, and the fuel filter contained within the fuel pump. In the Durex unit, the fuel filter is composed of a brass porous element, which I cleaned by agitating it in Chemtool B-12 fuel system cleaner, then blowing through it with compressed air. The fuel pump filter was a brass screen, which was cleaned in a similar fashion.

The result of these efforts? Still stumbling.

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Love You Gearly

Love You Gearly

As with all old vehicles, you need to place some cardboard and/or absorbent pads beneath the vehicle if you want to reduce the number of oil stains on your garage/shop floor. I had been noticing that the pad beneath the differential seemed to be collecting a little more oil than I thought was desirable…

Outside Differential Cover After Cleaning

Outside Differential Cover After Cleaning

Also, since I hadn’t changed the gear oil yet in the differential, I felt I could take care of a few things at once.

The differential cover came off easily enough. The oil (as differential oil usually does) looked pretty sludgy. More importantly, I did not see any chunks of metal or shavings in the drained oil. Very happy about that!

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