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#1 |
Registered User
Join Date: Mar 2013
Location: Anaheim Hills, CA
Posts: 323
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Fuel Pump Ticking noise?
Ok I have spent the day trying to figure out the knock on my truck. After eliminating a couple of things I started the motor and used an 18" screwdriver to try and listen for the noise. I listened to the heads and valve covers, nothing. Oil pan nothing, engine block I did not hear anything.
Fuel pump, there was a definite tick that to my ears sounded like it was timed exactly with the knocking noise my other ear was hearing. The noise through the screw driver was quieter than the knock but it was definitely there. Does this sound correct seeing as how a screwdriver is not meant to me an audio device or (assuming it is the source of the knock) should it have been louder because sounds travel through solids faster than air? If you are interested here is a video where you can hear the knocking. click on the link below and click on the picture of the engine. http://dadgummit.smugmug.com/Cars/Random-forum-uploads
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1971 Cheyenne Big Block Longhorn |
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#2 |
Registered User
Join Date: Mar 2015
Location: Fletcher, N.C.
Posts: 309
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Re: Fuel Pump Ticking noise?
It sure sounds like rocker arm but a way to test the fuel pump rod is to remove the pump from the block (this will allow the rod to slide down) then start the motor. If the knock is gone then it's likely the rod (it should measure 5 3/4" long). If it's not then I would check the valve lash adjustment or at the timing chain. I hope this gives you some other ideas...
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#3 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,615
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Re: Fuel Pump Ticking noise?
An easier way than a screwdriver is a long wood broom handle.
Stick one end behind your ear lobe. You'll narrow it down better that way. Sounds like a lifter or exhaust leak. |
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#4 | |
Registered User
Join Date: Mar 2013
Location: Anaheim Hills, CA
Posts: 323
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Re: Fuel Pump Ticking noise?
Quote:
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1971 Cheyenne Big Block Longhorn |
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#5 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Fuel Pump Ticking noise?
I had the same noise awhile back. It was the fuel pump return spring had broken and didn't keep the lever against the cam. It still ran but had that noise. When you take it off. Work the lever on the pump and see if it's nousy.
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#6 | |
Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: Fuel Pump Ticking noise?
Quote:
As shown in the cutaway, the fuel pump is driven off the camshaft so, what you have is either a lifter or the pump operating rod, eccentric, or the pump itself. Warm the engine, and drop the pump. That will only take a minute or two so the engine won't have time to cool. get someone to start the truck for you and listen again. If the noise is still there it will be a lifter on one of the two front cylinders on the right bank. If it went away, check rod and eccentric on the pump. I'm betting on a bad pump. Good luck. |
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#7 |
Registered User
![]() Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: Fuel Pump Ticking noise?
I had that exact sound on my engine...found fuel pump pushrod return spring broken in 2 pieces...
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72 C20 Longbed 05 1500 Z71 |
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#8 |
Registered User
Join Date: Mar 2013
Location: Anaheim Hills, CA
Posts: 323
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Re: Fuel Pump Ticking noise?
I warmed the engine, stopped it and pulled the pump off of the engine and the rod slid down. I started the engine and the knock knock is still there just as loud as before so it is not the fuel pump.
I am going to have to find a shop that is competent to do internal engine work, does anyone know of one in north Orange county, CA? Someone that can be trusted?
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1971 Cheyenne Big Block Longhorn |
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#9 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,235
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Re: Fuel Pump Ticking noise?
Well thats too bad. I had hopes it was the pump.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#10 |
Registered User
Join Date: Oct 2012
Location: Kansas and Iowa
Posts: 349
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Re: Fuel Pump Ticking noise?
I wonder if that could be what my knocking noise is. I'll be starting my truck on Monday so I'll see if it sounds similar. I sure hope so. I lifter, fuel pump, or exhaust leak would be SO much better than a spun rod bearing!
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White70C20 1970 Blue C20 - 250, 4 speed 1985 Ford Thunderbird 2005 Pontiac G6 |
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#11 |
Registered User
Join Date: Mar 2015
Location: Fletcher, N.C.
Posts: 309
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Re: Fuel Pump Ticking noise?
By not truly knowing how much had been done to the engine before me, I waved the machine costs and rebuild parts and still having an old block theory plus down time having to wait and opted for a "new" long block crate motor. Man this thing is sweet and the cost is not much more if any, than a total rebuild. Hopefully you'll not need either one...
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#12 |
Registered User
Join Date: Mar 2013
Location: Anaheim Hills, CA
Posts: 323
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Re: Fuel Pump Ticking noise?
So I have checked everything I can with my ability and the tools I have in my garage. Does anyone have a shop they can recommend in the OC Area who is good and honest?
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1971 Cheyenne Big Block Longhorn |
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#13 |
Registered User
Join Date: May 2012
Location: moose jaw, sk
Posts: 92
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Re: Fuel Pump Ticking noise?
just listened to your video of the knocking noise i had the same thing turned out to be connecting rod bearings shot on mine i'm going for a crate motor
Blaine |
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#14 | |
Registered User
Join Date: Mar 2013
Location: Anaheim Hills, CA
Posts: 323
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Re: Fuel Pump Ticking noise?
Quote:
Man, I just looked at crate motors and for a big block it will cost like $5-6000++ for new or $3-4000 for remanufactured. That is just too much, I cannot afford to have that much in this truck I will part it out before I go that far. I purchased this truck (with no knocking) partially because the motor was rebuilt 10 years and 40,000 miles ago.
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1971 Cheyenne Big Block Longhorn Last edited by Jonlopes; 06-15-2015 at 06:18 PM. |
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