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Bought replacement ignition barrel and keys. Told that I can bypass transponder with wrire to fuel pump cutting away black box and energising fuel pump without damage.


Year make and model?? I am assuming the box is the fuel pressure control module. But when you bypass it, it will make the pump run at full pressure all the time. Your fuel mileage will go down. Again, you can not bypass security. I can get a fuel pump to run. Different power points. usually the security will kill the fuel pump and injectors. The injectors are grounded to fire from the PCM. good luck on bypassing them. ASD comes in to play.

May 14, 2016 | Cars & Trucks

2 Answers

What is a bypass unloader


According to epowerwash.com:
"The unloader valve diverts water flow into bypass when the trigger gun valve is closed. Unloaders may be designed to respond to either an increase in pressure or a change in flow. The unloader valve may also be used for variable pressure adjustment."

More information here:
All About Unloader Valves ePowerWash

Jun 06, 2014 | Alfred Karcher Pressure Washer

1 Answer

How To bypass the Fuel Pump Relay


Don't bypass the fuel pump relay . power to the relay comes from the ignition switch on start cycle .when the engine is running the oil pressure switch takes over the circuit .so if you crash and the engine .stops so does the pump . If the fuel line brakes a bypassed pump will keep pumping spraying fuel and you could burn.

May 05, 2014 | 1997 Nissan Maxima

1 Answer

Ran jeep out of gas now it doesnt seem to be getting gas to engine


You most likely burnt your fuel pump out. you cam run a hot wire to the pump and see if it runs correctly. your not building enough pressure.

Nov 24, 2012 | 1994 Jeep Grand Cherokee

1 Answer

Replaced al of the valves but still will not operate on high preasure. Will build to high preasure only for a couple of seconds then back to low preasure.


your bypass pressure valve is weak and needs replacing,its letting water pressure bypass the pump going to the pressure gun

Aug 05, 2010 | Northstar Pressure Washer 3000 PSI

1 Answer

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.

Jul 11, 2010 | Karcher 2500 PSI Pressure Washer

1 Answer

Installed a new jet pump for shallow well (gravity feed to pump) - used old pressure tank - after about 4 months pump began kicking on and off constantly when in use - troubleshooting guide suggested it...


The pressure tank must have a certain amount of air in it so pump doesn't cycle as you say. The new pressure tanks have a bladder that separates air from water and keeps the pump from cycling so much. Make sure your pressure switch on the pump is OK--ie doesn't have burned contacts!

Mar 01, 2010 | Flotec Corrosion Resistant Shallow Well...

1 Answer

I have a 98 k1500 with 5.7 350 and it wont start, has spark and fuel at the tbi but the injectors wont fire, will run on ether if sprayed down the tbi any ideas


have the fuel pressure checked ,im assuming it is a vortec,
you need about 55 psi continusly to keep it running, i have a 96 2500 sierra. the fuel pumps were known to be terrable in these trucks. i put a new one in, then had to remove it to replace it again amonth later, they are flawed by manufacturing design.

Dec 16, 2009 | 1998 Chevrolet K1500

1 Answer

I have a karcher 2400 psi pressure washer and it doesnt get water pressurized when pulling wand trigger.


the most comon problem with thease is a stuck bypass valve, this is the valve that alowes the water to bypass round the pump when the triger is closed, when they stick all of your pressure runs around the pump and not out of your nozzle,,
its located in the centre of the pump on the top, undo the 2 cap screws pull out valve greese and re fit

Jun 08, 2009 | Honda Karcher G2400HH-R Pressure Washer

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