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[C2] Leaking '67 fuel pump, now gas in my oil?

Old 12-06-2018, 12:35 AM
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Fawndeuce
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Default Leaking '67 fuel pump, now gas in my oil?

Hi,
I haven't been on the forum for a while, life, work and travel...
So while away on one of my recent business trips, the wife calls to say the house smells of gasoline, this type of thing of course invariably only ever happens when I'm somewhere on the other side of the planet...
It probably had been a month since I had last driven it, when I got home I traced the leak to the air hole above the diaphragm, the pump is lower than the tank so it was dripping even though it hadn't run in a while.
The '67 pumps cant be taken apart, so I stopped the flow and a new one is on order, but since the diaphragm is compromised, would there now be gas in my 2 month old oil? I would imagine that it must have been leaking at least a bit the last time I drove it.



Paul

Last edited by Fawndeuce; 12-06-2018 at 12:43 AM.
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Old 12-06-2018, 01:13 AM
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I think I've answered my own question, oil would leak from the air hole regularly if the area above the diaphragm wasn't isolated from the block?


Paul
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Old 12-06-2018, 09:01 AM
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If it leaked enough fuel to stink up the house, you should be able to smell it on the dipstick if there's any in the sump. Also see if the sump appears to be overfilled. Safest thing to do is drain and refill.

Live well,

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Old 12-06-2018, 09:52 AM
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Cost of oil and filter change vs potential cost of engine rebuild.

Yeah - thatís a tough call.
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Old 12-06-2018, 10:12 AM
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not likely,

but change the oil and filter anyways
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Old 12-06-2018, 10:32 AM
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I think the gasoline would just about have to flow up hill to get in the crankcase from a fuel pump leak. Pull the dipstick and sniff it. If a slight smell of gasoline, don't worry about it. Strong smell change the oil. My bet is there will be little to no odor of gasoline on the stick.

However, if you're concerned about "the children" or "peace of mind", by all means, waste money on changing the oil if you get a slight whiff on the dipstick.
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Old 12-06-2018, 10:02 PM
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Thanks for the feedback guys, no overfill and no gas smell in the oil.



Paul
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Old 12-06-2018, 10:19 PM
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Originally Posted by Frankie the Fink View Post
Cost of oil and filter change vs potential cost of engine rebuild.

Yeah - thatís a tough call.
Frankie I am with you. I just tore down a 327 that the bearing were down to the brass. Machine shop guy said that one of two things were most likely. Too tight on the clearances, (which I don't think is the case) or the oil was diluted with gasoline, so yeah. tough call. NOT.
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Old 12-07-2018, 02:10 PM
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Originally Posted by vettsplit 63 View Post
Frankie I am with you. I just tore down a 327 that the bearing were down to the brass. Machine shop guy said that one of two things were most likely. Too tight on the clearances, (which I don't think is the case) or the oil was diluted with gasoline, so yeah. tough call. NOT.

No panic since the engine wasn't started and no odor or overfill. Machine shop guy limited you to too little information.

https://www.knowyourparts.com/techni...earing-damage/
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Old 12-07-2018, 11:41 PM
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Originally Posted by MikeM View Post
No panic since the engine wasn't started and no odor or overfill. Machine shop guy limited you to too little information.

https://www.knowyourparts.com/techni...earing-damage/
Thanks Mike.... The bearings looked exactly like the ones in your link- insufficient lubrication, fuel dilution. Thanks for confirming exactly what t the machine shop guy told me 👍👍

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Old 12-08-2018, 01:16 PM
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Hi guys,
I thought you might find this interesting. As mentioned in my second post, I figured there had to be a seal between the fuel pump and the block (my rebuildable '62 pump has one), otherwise oil would leak from of the air hole above the diaphragm.


Paul

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Old 12-08-2018, 01:24 PM
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I get a single drop of oil that hangs off the bottom of my 4657ífuel pump. Doesnít really drip. Wipe tt off and it comes back. Removed the passenger side tire and snugged the mounting bolts yesterday and weíll see what happens. Iíll rebuild it if needed but I donít like the current rebuild kits. Any recommendations?
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Old 12-08-2018, 01:34 PM
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My '62 pump doesn't have an air hole, but I've had oil leaks from the mounting flange to the block. I've changed and sealed the gasket in the past, stays dry for a few years, but I noticed when I changed the oil again last summer that its dripping again, didn't have the time to pull and reseal, one more thing on the list.
The kit I got for the '62 was from Paragon, no issues, but that was many years back...



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Old 12-08-2018, 03:37 PM
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Originally Posted by vettsplit 63 View Post

Thanks Mike.... The bearings looked exactly like the ones in your link- insufficient lubrication, fuel dilution. Thanks for confirming exactly what t the machine shop guy told me ����

My point was, there is certainly more than just one reason for insufficient lubrication than fuel in the oil. It's not clear to me how your machinist came to that conclusion by looking at a pile of your parts.

Since the engine wasn't started, no gas was in the crankcase and thus, no reason to change oil.

Last edited by MikeM; 12-08-2018 at 03:40 PM.
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Old 12-08-2018, 04:51 PM
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Mike, I could have been more clear. I kinda hijacked the OP's thread when i got to talking about a 327 I disassembled that is in need of a fresh up. On looking at the bearings, which looked exactly like the ones in your link inder insufficient lubrication or fuel dilution, he said that looked like what the engine's history was. Sorry for making it appear I was the OP. That was a really good link, by the way, that shows diffferent bearings, and what malady the engine suffers from, be it dirty assembly, metal contamination, or other. Thank you for posting that. It is good information. PS- i saw a big block chevy that the bearings had been suffering from insufficient lubrication . They finally traced it to be due to the spin on oil filter adaptor having too small holes for sufficient oil flow. ( it was a pre 68 block) They enlarged the oil passage holes in the adaptor, and the bearing problem went away. Who'd a thought?

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Old 12-09-2018, 06:14 AM
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Originally Posted by vettsplit 63 View Post
Mike, I could have been more clear. I kinda hijacked the OP's thread when i got to talking about a 327 I disassembled that is in need of a fresh up. On looking at the bearings, which looked exactly like the ones in your link inder insufficient lubrication or fuel dilution, he said that looked like what the engine's history was. Sorry for making it appear I was the OP. That was a really good link, by the way, that shows diffferent bearings, and what malady the engine suffers from, be it dirty assembly, metal contamination, or other. Thank you for posting that. It is good information. PS- i saw a big block chevy that the bearings had been suffering from insufficient lubrication . They finally traced it to be due to the spin on oil filter adaptor having too small holes for sufficient oil flow. ( it was a pre 68 block) They enlarged the oil passage holes in the adaptor, and the bearing problem went away. Who'd a thought?
I never heard of such a thing....doesn't mean it didn't happen though...

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Old 12-09-2018, 12:07 PM
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Originally Posted by MikeM View Post
My point was, there is certainly more than just one reason for insufficient lubrication than fuel in the oil.
I agree. Diluted oil can certainly wipe out bearings, but more often than not, especially with non-hobby cars bearings that look like that often come out of engines that have not had its oil changed often or ever, that are never warmed up to boil off water and fuel so that sludge builds up sufficiently to obstruct orifices and on newer engines with tight clearances sludge is especially problematic.

Next time you are in traffic, look around at the cars and folks behind the wheels. Ask yourself, how many of these folks change their oil every 3,000 miles, every 7,500? How many even check?

Dan

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Old 12-09-2018, 12:12 PM
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Originally Posted by dplotkin View Post
I agree. Diluted oil can certainly wipe out bearings, but more often than not, especially with non-hobby cars bearings that look like that often come out of engines that have not had its oil changed often or ever, that are never warmed up to boil off water and fuel so that sludge builds up sufficiently to obstruct orifices and on newer engines with tight clearances sludge is especially problematic.

Next time you are in traffic, look around at the cars and folks behind the wheels. Ask yourself, how many of these folks change their oil every 3,000 miles, every 7,500? How many even check?

Dan
More than you might think - modern cars have wider oil change intervals and "nag" lights in the dash to inform you when its time for the oil change....wife's 2016 Durango and my 2013 Tundra both do...

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Old 12-09-2018, 12:17 PM
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Gas in the oil is not a problem.

Many aircraft engines have oil dilution systems for starting in cold weather. The gas just evaporates off.
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Old 12-09-2018, 12:34 PM
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Not buying it....get enough gas in your car's crankcase and its not going anywhere -- just like it doesn't from your vented gas tank. Don't know about aircraft...
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