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Air pressure is fine at regulator but coming out of the hose the pressure drops rapidly.

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The hose has an internal break causing it to squeze together. Replace the hose. 

Posted on Sep 06, 2009


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1995 isuzu pickup wont start sometimes

Fuel Pressure Regulator is located on the fuel rail.

1. Disconnect the negative battery cable.

2. Properly relieve the fuel system pressure.

3. Remove the air cleaner outlet tube(s).

4. Remove any necessary components to access the pressure regulator.

5. Disconnect the vacuum hose from the pressure regulator.

6. Remove the pressure regulator attaching screws.

7. Remove the pressure regulator from the fuel rail.

To Install

8. Discard the O-rings on the pressure regulator and replace them with new ones.

9. Lubricate the O-rings with clean engine oil.

10. Install the regulator into the fuel rail and tighten the retaining screws.

11. Connect the vacuum hose to the regulator.

12. Install any components removed to access the regulator.

13. Install the air cleaner outlet tube(s).

14. Connect the negative battery cable.

Jul 03, 2012 | Isuzu Pickup Cars & Trucks


How to Adjust an Air Compressor Regulator

  • Plug the air compressor into the appropriate electrical socket. There are a few air compressors that come with a 4-prong electrical cord, but most of them will come equipped with a 3-prong electrical cord. The 3-prong electrical cord is set for use with a standard 110 outlet. The 4-prong electrical cord is generally used for 220 outlets.
  • Turn on the machine.
  • The air compressor should be fill completely to the range from 100 to over 200 per-square-inches, depending on the unit capacity.
  • The manufacture guide will inform you which tools can be used with the unit once it has reached full pressure.
  • The tool should be connected to the air hose and the air hose to the compressor.
  • To drop air pressure you should turn the regulator adjustment knob counterclockwise and to increase the air pressure you should turn it clockwise.

on Aug 27, 2008 | Campbell Hausfeld 04 Gallon Twin Stack...

1 Answer

My psi is 150 and the tank turns off but my regulator pressure is at 0, this is a brand new tank and never been used before.

Hi scooterb88...
Sounds like your pressure regulator needs adjustment...
Turn the knob on the pressure regulator clockwise and you should start hearing air coming out of your hose...Once air is coming out, remove your hose and keep turning the regulator till you get to your desired working pressure normally around 90 psi...leave your pressure regulator at that setting and it will stay at that setting.
Please take time to rate me

Sep 17, 2011 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

Ec12. Runs fine. Tanks fill fine. Just run out of air when using large volume items. i. e. framing nailer, filling tires. Like its taking too long for air to get from tank to end of hose. Almost like there...

You are correct in suspecting the regulator. Easy fix however. Remove the safety pop valve and install a tee fitting. Reinstall the safety on one port and install a quick-connect fitting on the other port. Now you will have access to full tank pressure when you need full power. In the process of regulating pressure, the 1/4 inch port size adjustable regulator will restrict the air volume. A 3/8 port size (larger air regulator ) is less volume restricting however more expensive. You can install a 3/8 port size regulator on your compressor in place of the small one installed now. Other possible trouble areas are too small inside diameter air hose , too long of a hose and air hose that has inner liner torn and is restricting airflow. Good luck

Apr 15, 2011 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Compressor comes on then stops wait a min comes on again and imediatly stops again

If you are using the air supply between when it stops and when it comes on again, then this might be normal. You havent mentioned what model/size compressor you have, but if is only a small 1-4 Gallon tank model, then these dont really hold a lot of air, and if you are using any air tool that uses a lot of air, you will be exhausting the tank supply VERY quickly, so the compressor fires up again to refill the tank.

If the compressor is only staying on for a split second after it fires up again, try plugging the compressor in directly to a wall outlet (ensuring the outlet is properly rated) and avoid using extension cords, which can leave the compressor with little power to overcome the tank pressure to kick over and refill. Compressors are best run directly connected to a main outlet, not via an extension cord.

There may also be a problem with the switching/regulating mechanism for the motor if it is jumping on and off in rapid succession. Check your regulator/tank pressure gauge. Take note of what pressure it kicks back on at, and what pressure it stops at. Many compressors will kick back in when the tank pressure drops to 80 PSI, and may stop when the pressure reaches 100-120 PSI.

I hope that helps!

Feb 13, 2011 | General Air Tools & Compressors

1 Answer

Pressure switch adjustment problem...

I think I follow you... the adjuster over the large screw is used to set your tank pressure but also sets the cut-in/cut-off pressure. You have another regulator to control the pressure to and thru your hose but that doesn't insure that you won't exhaust the tanks supply and use more air than your pump can produce. It doesn't matter what pressure you set it at if your pump can't produce enough cubic feet per minute of air to keep up with your output. If your air use/output is within the pumps output, your idea will work just fine and you can set the hose regulator just below the cut-in pressure but Remember, even a little airbrush uses a lot of compressed air but sanders, grinders, sprayers and impacts use a Ton so don't try this without having somebody monitor the compressor periodically while you try it. It all depends on your air demand.

Apr 27, 2017 | Campbell Hausfeld G5396 7 Hp 60 Gallon...

1 Answer

Where is the location of the fuel regulator valve

If you mean your fuel pressure regulator. It's located on the CSEFI injector assembly, the regulator is located under the air intake plenum on the back of the fuel meter body.
If the regulator is bad it may cause either a drop in fuel pressure or an increase in fuel pressure at the rail . A drop in fuel pressure, if severe enough, can cause bad or no idle condition, engine starving for fuel and etc.

If the regulator is causing excessive pressure it can cause fouled plugs, black smoke from exhaust and rough engine performance.
Before you change the regulator check for cracked, rotted or disconnected vacuum hose.

Also you can connect a fuel pressure gauge to the schrader valve on the rail and monitor the pressure to see if it is in specifications, or to see if the fuel pressure drops rapidly after engine shutdown.

Hope this helps and good luck with your project. Thank you for using Fixya

Mar 09, 2010 | 1999 GMC Jimmy

3 Answers

The air tanks fill with air, but the pressure

The regulator sounds like it is cranked closed. Try slowly operating the adjusting knob in the opposite direction. As the valve moves, you should see the pressure rise on your gauge (it probably does work).
Hope this go make something!
Best regards, --W/D--

Jul 18, 2009 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Air compressor pressure not regulating

Usually you cannot adjust the cut out pressure of the tank/motor itself, this is why they have regulators, which regulates the pressure flowing down the air lines (regulators like these dont regulate actual tank pressure cutout). To regulate air flow using the regulator knob, you actually have to have air flowing through the hose while you make the regulator/pressure adjustments as regulators regulate pressure DOWNSTREAM from the actual regulator itself.. so air flowing through is a must. Attach an air blower or something similar and let air start flowing through the hose. Now turn your regulator knob in the "-" direction to decrease regulated pressure. It is best to bring pressure all the way down to "0" first, then open the regulator up (by turning to the "+" side) and pressure will rise until you get to the desired pressure needed for the air tool in use. The tank pressure will still be between 80-125 PSI as the motor regulates and keeps the pressure in the tank between these values automatically, but your line/hose air flow pressure will remain at the regulated pressure (say 40 PSI or whatever you set using the regulator knob).

Hope that helps and makes sense.

Please rate this solution on FixYa!

Jun 18, 2009 | Makita Factory-Reconditioned 2.5 HP Air...

1 Answer

No air pressure at the hose

It sounds like you have trouble with your pressure regulator. Make sure that the knob for the regulator is turned clockwise to increase pressure. If this doesn't work, you may need to replace the regulator.

May 24, 2009 | Hitachi EC12 Portable Electric 2hp Air...

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