WagonCrazy
07-10-2015, 06:24 PM
Replaced a 2 year old malfunctioning (stock, cheap, chinese probably) fuel pump on my SBC today, with a new mechanical Holley 12-834 pump. 7.5 psi, 80GPH. Thats all I need for this 300 hp engine with an Edelbrock 600 carb.
Figured it was a simple swap. And it was.
Got it all back together, runs great now.
But I hear a faint knocking noise coming from down low...random at idle...kinda comes and goes...faint, but I can hear it and it WASN'T there before I did this fuel pump swapout.
Put a stethoscope to the top of the fuel pump, YEP...sounds like the pushrod is not all the way tight.
I thought a SBC fuel pump pushrod was a universal length?
Are there different lenghts? I must have one that's a hair too short?
Aargh...
Figured it was a simple swap. And it was.
Got it all back together, runs great now.
But I hear a faint knocking noise coming from down low...random at idle...kinda comes and goes...faint, but I can hear it and it WASN'T there before I did this fuel pump swapout.
Put a stethoscope to the top of the fuel pump, YEP...sounds like the pushrod is not all the way tight.
I thought a SBC fuel pump pushrod was a universal length?
Are there different lenghts? I must have one that's a hair too short?
Aargh...