big block fuel pump push-rod problem
#692981
05/09/10 08:33 AM
05/09/10 08:33 AM
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Joined: Aug 2003
Posts: 8,828 Houston, Tx
hemi68charger
OP
master
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OP
master
Joined: Aug 2003
Posts: 8,828
Houston, Tx
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Hey gang.. Wishing to tap into the collective... I have a friend with a '68 Charger R/T. He's been going through push-rods for the fuel pump like no body's business. He replaced the purple-shaft cam he had in it for nearly 15 years. After that, he's gone through two different cams, two different fuel pumps and about 5 different fuel pump push rods. All situations end the same, the push rod is damaged and worn down. When he replaces the push rod, he claims it moves freely in the guide hole. One local suggestion is the oil he's putting in now has no zinc in it. They suggest Royal Purple.
Personally, I've been changing my oil over the years and have never had a push rod problem. There are countless 440 running around and I don't see a rash of fuel pump push rod failures....
Thanks for any insight. Troy
TroyHouston Mopar Connection Club'69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi) '69 Charger 500 440 - 4speed - 3.54 Dana '70 Road Runner 383 - 4speed - a/c (now with 440)
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Re: big block fuel pump push-rod problem
[Re: PJM]
#692983
05/09/10 11:21 AM
05/09/10 11:21 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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get a new confirmed hardened p rod (maybe even a low mile oe one made way back if all else fails). (not sure which new one to recommend) but I have faith in Dave Hughes'stuff if he offers them. there was an comprehensive thread on this awhile back if you can retrieve it. Always want enough zinc but the p rod is the #1 prob. EDIT MP cams have ALOT of quality control probs also (& valves)
Last edited by RapidRobert; 05/09/10 11:22 AM.
live every 24 hour block of time like it's your last day on earth
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Re: big block fuel pump push-rod problem
[Re: todd440]
#692988
05/09/10 10:40 PM
05/09/10 10:40 PM
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Joined: Jun 2004
Posts: 3,319 Chicago Burbs
sthemi
master
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master
Joined: Jun 2004
Posts: 3,319
Chicago Burbs
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In addition to the lack of zinc in new oils, and the quality problems of the Mopar rod, what kind of fuel pump is he running? The spring pressure may be too high in the pump or may be binding causing too much wear.. My be guess would be the lack of zinc in the oil. Be sure to run oil with extra wear additives, like Valvoline Racing, or Brad Penn... The fuel pushrod would be the least of the worries if the oil breaks down and the cam/ lifters start wearing out...
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Re: big block fuel pump push-rod problem
[Re: JohnRR]
#692993
07/07/12 07:11 PM
07/07/12 07:11 PM
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Joined: Jul 2003
Posts: 1,212 Canton, Ohio
Crazy68Dart
pro stock
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pro stock
Joined: Jul 2003
Posts: 1,212
Canton, Ohio
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Talk to Howard at RacePumps. Pretty sure he makes them for BB Mopar. He is a good guy and I would have no concerns over quality coming from him.
383, Hemi 4-Speed, AlterKtion, D60
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