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I have a serfas fp200 floor pump that no longer pumps air. The piston goes all the way down with no resistance, so no pressure develops. It's not the hose.

Posted by Eric Hayashi on

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John Trevino

  • 1420 Answers

SOURCE: Low Pressure

I worked at a tool rental while attending college and had the opportunity to work on a variety of pressure washers, however, they were of the commercial type. Commercial washers are slightly different in that they usually have seperated components for easier service. Attached to the pump by fittings or rubber hose were the pressure regulator (which has the bypass unloader inside), chemical injector, pressure gauge as well as the hot water release safety all external to pump. Your pump has all these components in one case. By far the most troublesome component is the pressure regulator/unloader which when failing will result in low pressure because it will bypass water back into the intake as you suspect is happening to yours. Here are a few things to check. I believe that your pump is 2500 2.4 gpm. Test gpm water capacity by running pump normally with hose and proper tip attached. Spray water into bucket for one minute and verify that you are pumping 2.4 gallons of water (or what ever gpm your machine is rated). Measure the amount of water that your machine delivered. If it delivered proper gpm and pressure is low then problem could be worn or improper tip. The pressure is created at the tip and pressure will drop as the tip wears. As the unloader/bypass wears, water will bypass at a lower pressure. (Try lowering the pressure regulator all the way ) If water measures less than rated delivery than the machine is bypassing water due to worn regulator/bypass, checkvalves pitted, oring in front of checkvalve worn or cut or missing, or body of pump where checkvalve/oring seat is pitted allowing water to leak past valve. The cap that is removed to access checkvalve must presses against checkvalve with enough force to prevent water from leaking thru oring and body of pump. Examine checkvalves and orings with maginfy lens and look for pitting. Valves surface and orings must be very smooth and tight fitting to work properly. Body of pump where checkvalve oring snuggs against must be very smooth. Any surface where oring seats must be smooth. As water bypasses it cuts metal and orings just like a leaking faucet so look for cuts in metal and rubber. This info and my experience is better suited for larger pumps and higher pressure but maybe it will help. Good luck with your repair.

Posted on Jul 11, 2010

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James Dodson

  • 99 Answers

SOURCE: When using my new Serfas

Do you have the connection to the tire valve tight? You must have the connector pushed completely down and the locking lever pushed in the down position. Be sure it can not be pulled off of the valve while pumping up the tire.

Posted on Feb 12, 2011

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Daniel wettstein

  • 69 Answers

SOURCE: my clutch goes straight to the floor with no resistance

What year make model are we talking about

Posted on Mar 03, 2013

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2 Answers

My brake pedal slowly losing pressure goes to the floor and then I have to pump it up again


If you break fluid level is correct and your break pedal goes down to the floor means that your master cylinder is going bad and you might loose your breaks completely if not checked or replaced. Your breaking system is down to the last O ring inside the master cylinder, once that rubber O rings goes you will not have any breaks at all. Master cylinders have a number of rubber O rings that work like a plunger or piston that produce pressure within the breaking system. When the first one wears down due to age, your pedal begins to loose break pressure and you have to pump your breaks several times to gain breaking. You are now down to the last rubber O ring and a warning that your master cylinder needs to be checked. You can still use your breaks but only for a few days before the other rubber O ring gives out too. Once both O rings give out you completely loose your breaks.

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1 Answer

I just have a hard time figuring out how to inflate my tires with this pump. I assume I should use the smaller connection. Can't make it inflate.


http://wiki.answers.com/Q/How_do_you_inflate_a_presta_valve_tube

I am disappointed to find that the Serfas website has NO instructions for their pumps or other products, as if it is intuitive for a novice to operate them.

As a customer you should contact them and complain.

800.424.0047

[email protected]

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I bought a serfas bike pump some time ago and am not sure how to attach it to the tyre. Whether the lever is up or down, it does not attach and slips easily when pumping. I seems wrong. please inform of...


generally you have to put the pump up to the nozzle and have the lever down then put the nozzle in tightly and then pull the lever up. If after several attempts it doesn't work the pump may be broken, as bike pumps generally break easy

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I have a Serfas WFP-200 Floor Pump. I don't have a manual or instructions for it. I just recently brought out my bike: women's Giant bike, which I haven't used for four years and the tires were flat. I...


you may have a presta valve which is a different compare it to the one on your car lets say if they are the same you imple place the pump nozzle on the tube and open the lever to lock in place is indeed it is presta the have a much smaller size simple open the nozzle and flip the to pieces inside to allow the pump to be presta capable ok also you will need to screw open the presta valve before trying to pump ok if its still alittle frusterating simply bring in the pump to your local bike shop and they will be more than happy to give you the low down on the pump functions ok :) happy riding ok :)

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1 Answer

When using my new Serfas floor pump air doesn't go into the tire. The line pressurizes but nothing in the tire itself.


Do you have the connection to the tire valve tight? You must have the connector pushed completely down and the locking lever pushed in the down position. Be sure it can not be pulled off of the valve while pumping up the tire.

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I have no oil pressure in the car we pulled the valve cover today and found 6 of the rocker arms were not installed, we havent pulled the other cover yet however with this not installed would this affect...


Hi,
are you serious? Aside from that question. If there are rocker arms missing it could affect the oil pressure. Are the oil feed holes in the area of each missing rocker plugged off?

Perhaps I had better back-track here. If the oil lube system has no restrictions in it then there will be minimal oil pressure developed. The oil pump will be pumping oil to the lower end of the engine and that will be where oil press if any will be developed.

The rocker area has drillings which restrict the oil delivery from the pump, however, the rocker arms themselves offer resistance to the oil supply and the oil must have enough flow and pressure to form a circle of oil within the rocker arm and thus keep it clear of the shaft. The oil flow goes through the rocker arm, and down over the valves and pushrods,(if fitted) and drops back down into the oil pan. Different set ups can be used, but that's a basic configuration.

The engine lubrication is designed with certain resistances, and they in turn affect the flow of oil and the pressure developed by the pump.

Good luck.

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On a 2002 saturn l200 with an abs system, do i need to use a scan tool to return the rear displacement cylinder pistons to the home position or the upmost position, the manual i have says it will run them...


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