I bought a new GM Performance 350 for my 86 Silverado and it didn't have the provision for a mechanical fuel pump and I went through several pumps in the first year but I bought a Carter P4070 and installed on the frame rail and it's now been over 3 years the Holley pump I installed was REALLY...
Not trying to be mean but I've seen a bunch of these trucks don't know what good a picture would do and I always install the orifice with the short side in wire mesh toward the compression
Vent air is just ambient not cooling at all and low side is low enough that the compressor cycles but if I try to add enough to keep compressor on the high side goes higher and at that point I unplug the compressor
Not immediately the high side will start up when I start putting freon in and then the compressor will kick off and on but as I keep adding freon the high side will just keep climbing although the compressor will still cycle on and off although of course less frequently and I thought the same...
The low side sucks right down to around 20 then the compressor cycles off and on I know that the book says 3.2 pounds but the high side keeps climbing and yes I'm charging through the low side