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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: dumbucket1 on May 27, 2007, 07:36:58 pm

Title: Will a bad fuel pump cause a knock?
Post by: dumbucket1 on May 27, 2007, 07:36:58 pm

I took the 76 454 silverado to my moms today, about a 20 mile drive on the interstate. The truck did fine, but when I started to go home the truck tried to stall out a couple of times and then had a very low knock that has not gone away. I drove the truck back to my moms and that is where it sits. I am just wondering if the fuel pump may be failing would this possible cause this knock? If not I guess I'm looking at a rebuild. Darn I knew it ran too good when I bought it lol.

Title: Re: Will a bad fuel pump cause a knock?
Post by: VileZambonie on May 27, 2007, 09:01:32 pm

Get a stethoscope. doubt it's your fuel pump

Title: Re: Will a bad fuel pump cause a knock?
Post by: dumbucket1 on May 27, 2007, 10:27:33 pm

well I did some digging on google before I posted on here and I read about a lot of fuel pump pushrod failures on 454's that sounded like rod knocks and the truck did try cutting out like it was starving for fuel so I put 2 and 2 together. I'll just give it a shot.

Title: Re: Will a bad fuel pump cause a knock?
Post by: dumbucket1 on May 28, 2007, 09:41:53 am

well  figured it out the the exhaust valve isn't opening on #2 cylinder so either the cam went flat or the lifter collapsed. Pull the plug wire off and it quits knocking.

Title: Re: Will a bad fuel pump cause a knock?
Post by: Stewart G Griffin on May 28, 2007, 10:06:31 am

Post rescinded due to problem being solved.