Fuel pump leaking oil..lots of it!

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Old July 14th, 2018, 10:21 AM
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Fuel pump leaking oil..lots of it!

Hi. I have a 68 442 with a non numbers matching 455. Engine runs strong and purrs like a kitten. Lately I have noticed a substantial oil leak which has sprayed oil all over my suspension and radiator shroud. I have narrowed it down to the fuel pump which I tightened up bolts but continues to leak from that area. Does it need a new gasket or a entire new pump. Once again, it runs perfect right now. Any help would be appreciated.
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Old July 14th, 2018, 10:22 AM
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New gasket.
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Old July 14th, 2018, 01:46 PM
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I’m pretty sure the fuel pump lever is splash lubed by the timing chain, I don’t see how oil can be spraying from the gasket. Are you sure it’s not oil/gas spraying from the little vent hole? Does the oil smell like fuel? Is the oil level slowly going up?
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Old July 14th, 2018, 02:22 PM
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Originally Posted by matt69olds
I’m pretty sure the fuel pump lever is splash lubed by the timing chain, I don’t see how oil can be spraying from the gasket. Are you sure it’s not oil/gas spraying from the little vent hole? Does the oil smell like fuel? Is the oil level slowly going up?
x2 on checking this.
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Old September 4th, 2018, 03:29 PM
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Oil pump spraying all over passenger side engine bay

What causes the vent hole on the fuel pump to spray out oil/fuel mixture all over engine bay? 455 olds btw...
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Old September 4th, 2018, 04:01 PM
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A bad diaphragm, it needs replaced.
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Old September 4th, 2018, 06:25 PM
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Originally Posted by oldcutlass
A bad diaphragm, it needs replaced.

and change the oil. If you have fuel/oil coming from the vent it’s also venting into the crankcase. Fuel diluted oil doesn’t lubricant well.
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Old September 6th, 2018, 01:50 PM
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Even a small leak at the fuel pump gasket would make a huge slobbery mess because the forced air from the fan would spray it everywhere. If it is just a gasket, it is a fairly simple repair. If you are leaking oil from the vent hole in the fuel pump, you need to replace the pump. There is a diaphragm inside that is supposed to isolate the engine oil from the gas and also keep the oil from leaking out. If any of the previously mentioned air, gas, or oil are being allowed to combine, that is a big issue. If fuel is getting into the crank case it will dilute your engine oil very quickly and destroy your bearings. Obviously if the oil is combining with air, it is getting out of the engine and making a mess. If the fuel is getting into the air, it is making a mess and possibly a fire hazard.
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Old September 6th, 2018, 06:56 PM
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My original fuel pump on my '68 442 leaked oil at one of the casting seams on the side of the pump. Changed pump, no leak.
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Old September 6th, 2018, 07:08 PM
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I was using an old fuel pump on my 67 olds 400. It leaked a little oil but not from the gasket. I installed a new Delphi fuel pump and no more leaks.
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Old September 6th, 2018, 08:00 PM
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Why not pull it off and check.....I think it is cracked
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Old September 7th, 2018, 11:22 AM
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Throw in trash - if you can fit the 40736 Airtex. Amazon looks to be closing them out. $10 bucks or the one in the bargain bin for $7. Probably just missing the gaskets.
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Old September 7th, 2018, 11:55 AM
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Originally Posted by olds403
Throw in trash - if you can fit the 40736 Airtex. Amazon looks to be closing them out. $10 bucks or the one in the bargain bin for $7. Probably just missing the gaskets.
Wow, that is a bargain! Too bad it won't fit a SBO with AC. I tried a few years ago and the housing is just too tall.
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