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Mastercraft 6.5 Gal.3/4 hp does not hold pressure

My pump only comes on as I need water. No reserve? The pump goes on/off/on/off when the toilet is flushed. You run any tap while the toilet is being filled and the pump will continuously run till full and shut off but the pressure drops right back to 20psi? I don't know if this could be the foot valve (the water seems to be at the pump and not flowing back to the well, and it doesn't come on by itself when idle). I have a shallow well and the lift is less than 25', The pump has a built in tank but when I checked the pressure from the air fitting, water comes out? Is this normal?Any suggestions?? Thank you Bill

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  • 48,405 Answers

No it is not normal
if it is like a round tank and you use air pressure to set the operation then to have water there indicates that the diaphragm that separates the water and air has failed
nothing to with the foot valve but a non return valve at that tank or lack or set pressure

Posted on Apr 09, 2017


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Posted on Jan 02, 2017

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SOURCE: Mastercraft 2.0 hp air compressor will not build up over 25 psi

sounds like a bad or broken valves in the head. crankcase needs a vent which is sometimes a small hole drilled into the oil fill plug and will normally blow some air out the vent while it runs

Posted on Mar 23, 2009

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SOURCE: My 5 hp, 25 Gal. Craftsman air compressor is

It sounds like your intake valve is worn or defective. Take the head apart again and look to see if the valve is sealing properly. If you post a comment with your model number I can look up the specific parts at sears parts.

If your compressor is functioning properly, air should not come out of the intake muffler (filter)



Posted on Jul 03, 2009

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SOURCE: My craftsman 25 gal. 5 hp. compressor builds 120

Replace check valve the piston is getting stuck sometimes alloying the air to leak all the way down till it comes back on

Posted on Jul 21, 2009

ollie reece
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SOURCE: Compressor tank will not fill with air

piston rings gone valves stuck inside nonreturn valve jammed the pipe coming from the pump unit into the tank before it goes into the tank it goes to a gold valve you need to take this out and check the rubber and spring if the seem ok turn it around and put back in then get back to me buddy

Posted on Sep 16, 2009

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SOURCE: Air pressure does not go over 25 psi I have taken

Does it shut off at 25 psi or just keep running and never build more pressure than that? Also, did this come on gradually or suddenly? Also, was it being used regularly when it happened or had it been sitting for a while?

Posted on Mar 07, 2010

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My 1/2 hp mastercraft pump cycles ever 3 seconds roughly. The pressure switch is set at 40-60psi. Should I replace or upgrade my pressure tank?

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Shut down system. Drain tank. Fill tank with air via Shrader valve on top of tank until it has a few less psi than the low cut off setting. This will ensure that the tank still has water in it with some pressure still pushing it out when the pump kicks back on.

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Have you tried it with both (hot rod and Gas ) turned on at same time? Is tank well insulated? (looking from behind tank.)
Does temperature drop off quickly, or gradually? Did it supply hot water better before, or this is first time you really measured it out? Need to keep in mind that as hot goes out the top fitting to hot lines, cold is coming in the bottom fitting and beginning to mix with hot, which obvioulsy will cause hot to gradually become warm as it enters. 2 gallons out hot tap, 2 gals., at bottom of tank, then mixing as it flows in usually equals, about 2 gal or less of warm, then cold again. Get many complaints of only enough for a short shower when they have 6 gal tank. You can try adjusting temperature up a little to see if it helps. Keep an eye on pressure relief valve dripping excessively as well as shut pump off for 20min-30 min, then turn it back on before touching any taps, to see if it cycles at all, indicating a leak in the system. If pump doesn't cycle when turned back on, no leaks.

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