The ports labeled "IN" and "OUT" are on the transfer pump section of the IP.
Your no-start problem MAY be due, as the other posted stated, to a stuck metering valve, which is enclosed by the cover on the side of the pump where the valve mentioned in my picture is located. IF you decide to go that far into it, post back for some tips on getting the cover back on correctly.
Another cause could be a plugged return system. A Roosa pump will NOT inject fuel if the return is blocked, which can happen due to deterioration of the plastic governor damper ring.
Below is a link to a recent post showing photos of a failed governor ring and it"s replacement.Oh, yeah, the "spark plugs" you are seeing are actually glow plugs to pre-heat the air in the intake manifold for cold starting.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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