Centex Farmall said: (quoted from post at 11:36:42 05/09/12) Looking at the books again I see the pressure relief on the primary pump, looks fairly easy to get to. The other one you mention is the fuel return check valve?
I did pull the side cover off the pump this morning but could only see the end of the rack and that didn't do me much good. Was working solo this morning and couldn't see in there and move the throttle easily. When I get a chance I'll puller the filler neck and check from there. I'll also put new filters in it anyway.
I definately have some amount of fuel flow as opening any bleeder gets me a stream of fuel, also at the top of the plunger.
Yeah they call it a check valve. It does that, but is also the main pressure regulator on a B pump. It is more of a pain to get to. Both valves do the same job, but one is just set to a higher pressure. The B pump relies on the upper valve, others on the lower primary pump valve.
You can easily check the rack motion if the side cover is off. Working the throttle will move the arm at the front of the cavity as well as the inner arm that is behind it. This bypasses all the springs except for the shoe that pushes on the inner arm.
The slow pressure rise may just be a gauge gone stiff. They do have an orifice to slow them down so they don't buzz and die from fluid vibration but it isn't that slow. Any ordinary gauge will work for testing. Many pumps are set for about 35 psi to increase lifespan. They early ones are set for a skosh over 60. I have run both and it didn't really make any difference. Controlled by the little spring, not adjustable.
This post was edited by M Diesel at 12:04:32 05/10/12.
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