Question about Fimco Spot Sprayer, 25 Gallon, 3.8 GPM, 45 PSI, 12 Volt

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Pump surging and not priming itself

As soon as the pump hits 45 psi it turns off and on causing irregular spray patterns; and pump does not prime itself. Check strainer everything good, hooked garden hose directly to suction side and still same result


Fimco Pump 3.8 gpm 45 psi
Model # 5275017

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  • Contributor
  • 6 Answers

Old pump. they've been updated!

Posted on Aug 21, 2009

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  • 2 Answers

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Posted on Jan 02, 2017

  • 63 Answers

SOURCE: LAWN SPRAYER PUMP WILL NOT SUCTION

Check the screen in the tank, it very well may be clogged.

Posted on May 03, 2009

  • 6 Answers

SOURCE: I have a Fimco 2.1 gpm pump that worked fine last

clean the checkvalve in the pump with dish soap, and a toothbrush. scrub thoroughly and rinse off. replace and see if that works!

Posted on Aug 21, 2009

  • 1 Answer

SOURCE: I also have a FIMCO 15 gallon 12 v spot sprayer, won't prime

I use an emulsifier with Round-up to make it stick better to the weeds (Sticky Spreader). The emulsifier had made the solution less viscous and was not moving through the wire mesh filter that comes out of the bottom of the tank. I removed the filter and it works fine. I have a filter in the handle anyway so there is no need for two filters for my application.

Posted on Jun 06, 2009

  • 1 Answer

SOURCE: Insufficient Pressure From Pump

Take the strainer at the end of the hose on the tank off. Throughly clean it. I used an old tooth brush, then ran hot water through it several times. Also drained the tank and flushed it out 3-4 times with fresh water, then ran fresh water through the pump for several minutes

Hope this helps

Posted on Aug 09, 2009

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1 Answer

Pumping psi into gastank not priming carb


Fuel filter may be plugged. Pumping up a fuel tank will cause damage to the fuel pump diaphragm , the gas tank itself. Priming the carb is done by pouring gasoline in the vent hole of the float chamber.

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if that doesn't solve the problem let me know

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You have to use a low pressure nozzle ( usually black with very large spray opening) With the low pressure nozzle siphons your detergent in with the spray water . If you are using a high pressure nozzle the soap will not prime.

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My titan 330 airless paint spray will not shut off while primming


Airless paint sprayers should not turn off while in prime mode. As long as the prime valve is open the motor can pump paint but the system will not build any pressure. Once the prime valve is closed the pump should pump paint into the hose until it gets to the pressure level required to turn the motor off. If the pump does not turn off with the prime valve closed, it could be that the spring in the valve is weak and won't hold the valve closed under pressure. If the hose is up to pressure and the motor just keeps trying to pump paint, you may have a bad pressure sensor or it is disconnected from the circuit board.

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It sounds like the fuel pump is not working. Perhaps the install was not completed correctly. Things to check, fuel pump relay, wiring, voltage to the pump.
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I have a Guundfos CHIE 4 circulation pump that is constantly running. I closed the valve on the pressure side but is still runs. On a previous post I was told it "may have lost its prime". The pump is...


You have a defective pressure switch.But replacing the switch. Do the following; Open the pressure switch cover, and find the two adjusting nuts. One is for the cut-off pressure (40psi) and the other is for the cut-in pressure (20 psi). Adjust the the nut with a longer stem counter clockwise (loose) with the pump running. Take care not to touch the power line attach
to it. Continue the adjustment until the pump stops,
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Switch the power on to run the pump and slowly
open the control valve to appropriate setting such
that the pump doesn't lost the suction. Send your e-
mail for further comment. God bless u

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1998 suzuki gsxr750 fuel pump inop after replacing filter


You cannot bleed the fuel injection system.Test the pump alone (not on the bike) for sufficient fuel supply.Also check the fuel pump relay.
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HMSK80 Carb Queston


if it has a prime bulb on it the rubber may have deteriorated and is failing to prime?Just my first "guess" hope it helps (replacement bulbs can be found easily)

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