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Jul 21st, 2025 | | | | Joined: Dec 2003 Posts: 1,060 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 1,060 | Is is possible for there to be a connection between fuel pump failure and the cam shaft? I am talking about the mechanical parts not the diaphragm?
1946 1-ton Panel
1952 1-ton Comml. W/Grain Body
| | | | | Joined: Feb 2000 Posts: 4,886 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 4,886 | Yes, the cam lobe can wear enough to not pump the fuel pump, or the pump arm can wear out or even come apart. | | | | | Joined: Mar 2014 Posts: 4,208 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,208 | It used to happen commonly on Plymouth 383 engines made in the late 60s, but it was the push rod that sat between the cam and fuel pump that frequently failed. The worst part was the rod would mushroom on top and then it was very hard to remove. Even if it mushroomed just a tiny bit (which usually didn't happen on that sad engine). People finally started cutting a recess on both ends of the replacement push rods. I have not seen this happen on Stovebolt engines, but I have seen pump arms fail...on aftermarket pumps. Good luck.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Just don't get tempted to stick a finger into that hole and crank the engine to see if the lobe is still there- - - - -use a bright flashlight and an inspection mirror or maybe a magnetic dial indicator to check the cam lobe!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jan 2022 Posts: 1,986 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 1,986 | Just don't get tempted to stick a finger into that hole and crank the engine to see if the lobe is still there "Why not?" asked Stubby
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| | | | | Joined: Dec 2003 Posts: 1,060 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 1,060 | Thanks all, I replaced the fuel pump and things appear to work great. I am going to change oil to make sure it didn't get too contaminated. The old pump worked, but there was the elusive grey dust starting to form in addition to leaking like a sieve. I think that means something is wearing and the case is deteriorating.
1946 1-ton Panel
1952 1-ton Comml. W/Grain Body
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