Phil,
What is your friend's priming problem, is he losing the prime while the motor is running or is he unable to get a prime when starting? The number one thing that causes priming problems is an air leak, it either won't allow the pump to create a prime when starting or it brake the prime while running.
What is your friend's priming problem, is he losing the prime while the motor is running or is he unable to get a prime when starting? The number one thing that causes priming problems is an air leak, it either won't allow the pump to create a prime when starting or it brake the prime while running.