How to replace a1994 k1500 petcock - 1990 Chevrolet K2500

Bleed tank, remove petcock and replace.

the hissing noise is a vacuum leak; remedy it by replacing the hose, or if you can, cut off the cracked part and reattach it.

Have you tried online motorcycle breakers? If you are in the UK I could suggest one or two you could contact.

I have worked on the marine version of these engines many times, and find the knock sensor is normally located on coolant drain petcock. This is done because the "knock" sound moves efficiently through the coolant in the engine block. It is normally on the passenger side side of the engine, under the exhaust manifold. This may vary depending on engine model.

GROUND WIRE? ON FRAME? ENGINE?

Ninja_Rick already provided a diagram for 94 Altima serpentine belt:

http://www.fixya.com/cars/t4150117-alternator_belt_1994_nissan_maxima

if your battery is full charge and this problem the same, replace your starter

Very possible that selenoid is bad-did you have starter tested?(auto parts stores do this)Check all cables going to starter for corrosion and loose connection at starter. Corrosion gets inside of cables over time, so replace when in doubt. INSTRUCTIONS-remove negative cable from battery and move away from battery(tie off), on selenoid if fender mounted, remove cables from both sides of selenoid(is stamped with letters B and I)-when you remove, mark with tape which is I and which is B, in case replacement is different from old unit. then remove from fender(save bolts)-install new part on fender, and replace cables on proper sides(B or I). install neg. cable on battery-try to start....good luck!!!

if you haven't done this already ,try changing th line filter along the frame.after that is replaced .turn the key on (WITHOUT STARTING IT) several times tobuild pressure back up.thentry to start it.hope this helped .

Straight down on the bottom corner which would be the passenger side, facing the engine...