Question about GMC Denali

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A/c gas is leaking out of the low pressure tap port. I just changed the schrader valve in my ford van, it was doing the same thing. I looked into the port an did not see the schrader valve. So how do I change this type of valve. 2003 GMC PU 5.3

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Some of the valves unscrew. you have to replace the top of the port. Look closely at the port you will see that it separates.

Posted on May 18, 2011

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My Ford F150 engine stopped running at low RPM.. I wonder if it's bad gas? Clogged Fuel filter?


The first thing to check is the Fuel pressure at the Fuel Injector Rail schrader valve. You can get an inexpensive test kit at Harbor Freight. The pressure should be between 28 and 45 psi with the engine running. If it is lower than that you can replace the filter. If that doesn't cure the pressure problem then the pump is next. Fuel Filter Change Ford 150 250 How to Replace Fuel Pump

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Air conditioning ports -to add air conditioning fluid


What you are wanting to add is R134a Freon. The port that you are talking about looks like the same connection that is on your tires. It is called a Schrader valve. They have a cap on them like a tire valve stem. They are located on the air conditioner lines that lead to and from the compressor to the cabin. They are different sizes and if you are not familiar with them, find someone that is because you can get hurt or damage your a/c if you make a mistake.

Mar 11, 2015 | Cars & Trucks

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I have a 1999 ford expedition i have been have trouble starting it for a month now changed the fuel filter reset the fuel pump switch checked the fuses all good. It turns and half the time it starts now...


GO TO AUTO PARTS STORE BUY A FUEL PRESSURE GAUGE THAT CAN CHECK FUEL PRESSURE UP TO 100 PSI. LOCATE YOUR FUEL PRESSURE TEST PORT.LOOK FOR SCHRADER VALVE ON FUEL LINE NEXT TO EGR VALVE.PLACE A RAG NEAR THE SCHRADER VALVE AS YOU INSTALL FUEL PRESSURE GAUGE TO CATCH GAS SPILL AS YOU SCREW IN FUEL PRESSURE GAUGE HOSE FUEL PRESSURE 30 - 45 PSI WITH ENGINE RUNNING. THE ENGINE MUST BE OFF HOOK UP THE FUEL PRESSURE GAUGE.IF YOU HAVE TROUBLE THE FUEL PRESSURE GAUGE WILL HAVE INSTRUCTION HOW TO HOOK UP FUEL PRESURE GAUGE.BE CAREFUL CHECKING FUEL PRESSURE IS DANGEROUS JOB.DONT ALLOW NO MASSIVE FUEL SPRAYING WHEN HOOKING UP FUEL PRESSURE GAUGE YOU WILL GET CAR FIRE.

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1 Answer

My van run out of refrigerant how many ounces I need to fill up


gotta find the leak first if your low your ok if your out you need a machine to pull vaccum so check if ya got pressure on a schrader valve if ya do get a kit from parts store or wal mart comes with a guage

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2 Answers

Im looking for the low pressure port on a 96 ford taurus ?????


Oh, that's an easy one. The low pressure side is made up of larger diameter tubing than the high pressure side (aluminum tubing) that holds the refrigerant.

Also, the low pressure side always gets cold when working properly with the a/c on. The cold low pressure side piping will develop condensation on a hot day.

Sometimes the low pressure port is located on a post that sticks up and has a blue or black cap on it, similar to schrader valve but different.

The quick connector connects to the hose found in an r134a kit that may have a 12 oz. can of r134a for bumping up the amount of freon in your system (sometimes cars leak this gas slowly through o-rings).

Good luck to you on this.

Jul 09, 2010 | 1996 Ford Taurus

1 Answer

Van starts but does not stay running


Inadequate fuel pressure the fuel pressure must be checked at the fuel rail on top of the motor There is an access valve (schrader valve with cap) but you need a pressure tester to use it to detect the 30 psi + needed to run the van, cosidering the age of the vehicle it may have throttle body injection, try changing the fuel filter but before doing so let the vehicle sit with out the key on for at least 20 min. to allow the high pressure in the line to come down gas in the eyes is very unpleasant.

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How to release fuel pressure to replace fuel filter on a buick rendevouz 2004


if you open up the hood and find your fuel rail you should see a little cap just like what is on your tire valve stems. take the cap off and push the little valve in the center agian just like the valve stem on your tire. be vary carefull as fuel will spray out of this. that is how to depressurize the fuel system

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Slow a/c leak on Ford Escape


maybe too high pressures on hi side causing valve core to go bad can get new valve cores at local parts stores for less than five dollars

Jun 24, 2009 | 2005 Ford Escape

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