How do you replace the refrigeration high pressure line on a 2002 e 150 ford van

Look at the A/C line sizes. The larger of the two A/C lines is a low pressure. The smaller line is high pressure. Just follow the low-pressure line from the compressor all the way to the evaporator and you will discover the low-pressure service port somewhere along the line.

the larger line is from evaporator this is the low pressure port.
How to Add Refrigerant to 2005 2012 Ford Escape 2009 Ford Escape XLT 3 0L...

You may be low on R134a refrigerant, which means you have a leak.

Follow the fuel line to the engine. Look over the fuel rails and fuel connections looking for any cracks or breaks.

On top of AC Accumulator

Just to clarify......the sound is still there, even after you put in the new pump?

ok so much done owell next is the mass air flow to be checked then the fuel regulator to check pressure and the fuel pump for pressure and then check the cat,s for back pressure wood be my next thing and Last is the how many Km,s does it Have ?sounds like filter needs lookin at in the tranny if she,s got High Km,s if not then check the intake for leaks it,s Plastic so don,t hurt gone this far Let me Know What Happens,s Thank,s

P0533 A/C Pressure Sensor High.

It could be low on refrigerant, or it could be a bad sensor. Back-probe the pressure sensor connector (on the discharge line, near the compressor - it's a 4-way connector) on the dark blue wire with the engine running and the A/C turned to max. If you get no volts, or 5 volts, the sensor is bad. 4.5 volts indicates a properly-operating system, while less than 4.5 indicates low pressure, and anything above indicates high pressure. If low or high pressure is suspected, verify with a set of refrigerant gauges.

If warranted, the sensor can just unscrew. You won't lose refrigerant - there's a valve built in to the line to prevent that. Make sure to use a new O-ring and lube it with the proper oil if you do change the sensor.

There is no pressure when the engine is off. You don't have to do anything as far as putting pressure back in other than starting the engine.
Not knowing whats leaking and if its actually the lines then go get a replacement either at the parts house or the dealer.

!!! Why mickey mouse it. ???

try checking the fuel pressure if the van runs at idle you should have between 30 t0 45 psi anything more check the fuel pressure regulator