Thank you Toby for setting me strait but, I never said anything about what it does in any of my post only the potential of what could happen.That was implied on my first post but maybe you missed that so let me explain.
When the cap is off and debris gets in around the valve what happens? Well if you are screwing something on its to check the pressure the debris is trapped. screwing the pressure gauge on lets the debris that is down inside swirl around and very well can end up in the fuel rail or stuck in the valve itself which could cause a leak. Where does it go from the fuel rail? the Injectors.
Do you think that professionals stick something in the valve first to clear debris and spray the engine compartment and themselves with fuel? No they just put the pressure gauge on. If you do stick something in there to spray a little out you are asperating the fuel which is what it needs for ignition. You need to respect the fuel and it will respect you.
Not saying it will happen but it does increase the risk 10 fold of it actually happening. All of which could be totally prevented 100% with a cap. Just put a cap on it.
You doubt they look for the cap or they might? Sure some shops might not look for it but, the bottom line is they can fail you in VA for not having the cap.
Next you'll tell me it's important to have the plastic valve stem caps on you tires too
Do you need me to explain the difference between pressurized fuel and compressed air?
When the cap is off and debris gets in around the valve what happens? Well if you are screwing something on its to check the pressure the debris is trapped. screwing the pressure gauge on lets the debris that is down inside swirl around and very well can end up in the fuel rail or stuck in the valve itself which could cause a leak. Where does it go from the fuel rail? the Injectors.
Do you think that professionals stick something in the valve first to clear debris and spray the engine compartment and themselves with fuel? No they just put the pressure gauge on. If you do stick something in there to spray a little out you are asperating the fuel which is what it needs for ignition. You need to respect the fuel and it will respect you.
Not saying it will happen but it does increase the risk 10 fold of it actually happening. All of which could be totally prevented 100% with a cap. Just put a cap on it.
You doubt they look for the cap or they might? Sure some shops might not look for it but, the bottom line is they can fail you in VA for not having the cap.
Next you'll tell me it's important to have the plastic valve stem caps on you tires too
Do you need me to explain the difference between pressurized fuel and compressed air?