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Fuel pumps... WTH??? |
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maximus7001 
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Joined: Jun/27/2011 Location: Winnipeg,Canada Status: Offline Points: 1086 |
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 Posted: Jan/17/2017 at 11:23pm |
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The issue here is not the fuel seals failing but the oil seal being a crappy design.
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1968 Javelin SST
1997 GMC Safari AWD 2001 Daewoo Nubira SX (Winnipeg only model) 1997 Honda Accord EX (Canadian Model) Winnipeg, home of the Jets. |
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CamJam
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Joined: Jan/04/2014 Location: Arizona Status: Online Points: 6547 |
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Posted: Jan/18/2017 at 6:15am |
Scott, the latest pump is an Airtex 905 (for the 69 V8 with electric wipers) but I also bought Carter and Precision brands and they were exactly the same pump. Looks like they are all made by a Canadian company called AAC, though they all say Made in USA, so I assume they have a US factory too.
Edited by CamJam - Jan/18/2017 at 6:21am |
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CamJam
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Posted: Jan/18/2017 at 6:18am |
Correct. I've had zero problems with the fuel diaphragm .
Edited by CamJam - Jan/18/2017 at 6:22am |
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CamJam
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Posted: Jan/18/2017 at 8:33pm |
Larry, it's the oil seal that fails... nothing to do with the gas, and it's the new aftermarket pumps that are the problem. In fact, to fix the problem I took the bottom section from a mid-80s Airtex and attached it to the top section from a new pump. If you read the previous posts you'll see that they no longer stake the oil seals in like they used to. The 30+ year old oil seal is holding, while the seals on the new pumps blow out in a matter of days or weeks. The is the '69 electric wiper pump. I have no idea what the situation is with other years and types. As I have said earlier, the aftermarket pumps all seem to come from one source now, no matter the brand (the one exception I know of being RobbMc, which is more of a custom product). |
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farna
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Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
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Posted: Jan/19/2017 at 6:03am |
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Staking the seal is probably something they leave out when assembling. So we need to either stake the seal or put something like loc-tite on the seal (remove, put on loc-tite, stick back in and let cure overnight before running). I don't use a mechanical pump (4.0L EFI), but sounds like something that should be checked first. One more thing to worry about! I hacen't heard of anyone having that issue with pumps sent in to Then and Now for rebuilding, or other small collector car rebuilding services. They likely do a better job than the mass rebuilders.
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Frank Swygert
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CamJam
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Posted: Jan/19/2017 at 8:43am |
Yes staking or gluing the seal, plus increasing size of vent holes relieves vacuum pressure inside the pump that perhaps causes the oil seal to dislodge. That's my theory anyway (plus some guys on a Chevy forum).
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BBB69AMX
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Joined: Sep/20/2015 Location: Poughkeepsie NY Status: Offline Points: 14 |
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Posted: Jun/04/2017 at 2:55pm |
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CamJam.
I have been having this exact same problem with a new Airtex pump on my 69-390. I have oil pissing out the vent holes on my freshly done motor & undercarriage, what a freakin mess it made. I had put a new pump on since engine was fresh. Whoda thunk the fuel pump oil seal would crap the bed so soon  . I had 1hr. run time on motor and 30 over the road miles when seal quit and went into oil spray mode. I am going to follow your lead and do the mods on failed pump. Will update when done. Thanks Ray T
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farna
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Posted: Jun/05/2017 at 5:57am |
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Manufacturers farm out the lower volume parts to smaller companies. The new inspectors don't always know what t o look for, and the parent company doesn't inspect all the parts. You'd think they would inspect at least the first few, and respond to customer complaints. If you can find a number for Airtex it might be worth letting them know what you found, complaining to the vendor you purchased from probably won't do much good.
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Frank Swygert
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BBB69AMX
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Posted: Jun/05/2017 at 11:37pm |
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Follow Up, pulled fuel pump apart and found the oil seal & retainer had come out of place in cavity it sits in. Reinstalled and did four stake points, it will never come out again unless I pull it out. To wet to start car outside so I wait until the skies clear here in the east....tbc
RayT
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CamJam
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Posted: Jun/06/2017 at 9:09am |
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Great! Hopefully that's the last time you'll have to mess with it. It's about 8-9 months now that it's been working for me.
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'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST '69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD  |
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scott wrote: