gregchrysler Posted December 13, 2017 Share Posted December 13, 2017 Hello everyone anybody know what would cause gas to be in the oil pan. The garage said the oil was 30 % gas. Do u think it could be an intake vale stuck or bent? I ran an electric pump through the mechanical pump could th gas get in through there? Thanks everybody car is a Chrysler royal woodie 1949 also for sale Link to comment Share on other sites More sharing options...
Janousek Posted December 13, 2017 Share Posted December 13, 2017 Mechanical pump diaphragm torn leaking gas into engine is about the only logical explanation. Especially if the car runs OK. 2 1 Link to comment Share on other sites More sharing options...
gregchrysler Posted December 13, 2017 Author Share Posted December 13, 2017 thanks car runs ok wouldn't be from carb? Link to comment Share on other sites More sharing options...
Grimy Posted December 13, 2017 Share Posted December 13, 2017 Another possibility is overpressure from the electric pump dumping extra fuel into the manifold to a degree that the rings can't handle it. What's the rated output of your electric pump in psi, and do you have a pressure regulator on it? I think you should restrict the output from the pump/regulator to no more than 3 psi. Don't use the $20 regulators in the bubble packs at chain stores. A good one, like Holley, will be about $60. Assuming that the oil has been changed, sniff the dipstick periodically for gasoline odor until you're certain you've fixed the problem. 1 Link to comment Share on other sites More sharing options...
JFranklin Posted December 14, 2017 Share Posted December 14, 2017 I saw an engine that blew up due to a similar problem so be careful. Link to comment Share on other sites More sharing options...
PFitz Posted December 14, 2017 Share Posted December 14, 2017 (edited) You couldn't get 30% gas in the oil pan by way of past the rings and still have what anyone would call "a good running engine". But an electric pump driving through a mechanical fuel pump that has a diaphragm leak will put that much gas into the oil pan. BTW, no need for a regulator - just one more thing that can go wrong and possibly harm an engine. Summit Racing has low pressure 6 volt pumps for about $45.00. Paul Edited December 14, 2017 by PFitz (see edit history) 1 Link to comment Share on other sites More sharing options...
hchris Posted December 14, 2017 Share Posted December 14, 2017 Definitely passing through the mechanical pump Diaphragm; fuel in sump is a classic symptom of failed fuel pump diaphragm. Link to comment Share on other sites More sharing options...
Ben Bruce aka First Born Posted December 14, 2017 Share Posted December 14, 2017 I agree, Paul. If, in fact, that much gas in the oil pan . Been a long time since I was inside a Chrysler engine and I can think of no other way. Pull the fuel pump and inspect. Ben Link to comment Share on other sites More sharing options...
gregchrysler Posted December 14, 2017 Author Share Posted December 14, 2017 thanks everyone will run electric pump around mechanical Link to comment Share on other sites More sharing options...
Bhigdog Posted December 14, 2017 Share Posted December 14, 2017 50 minutes ago, gregchrysler said: thanks everyone will run electric pump around mechanical Or.........Replace the mechanical with a good one and use the electric only to prime the carb if the cars been sitting awhile or if you suspect vapor lock. The car was designed for a mechanical pump and will run fine with one. If it ain't broke don't fix it...................Bob 1 Link to comment Share on other sites More sharing options...
Bloo Posted December 14, 2017 Share Posted December 14, 2017 For a carbureted car there is NO better, no safer, no more reliable solution than a mechanical fuel pump driven by the engine, a fuel filter (not plastic) at the carb, and a sock on the fuel pickup in the tank, IF you can make it work without vapor lock. There are a whole raft of good reasons it was done this way for 50 years. Many on the forum have added a pump only for priming. That sounds like a reasonable solution if you need to do it due to an otherwise unsolvable vapor lock or dry start problem. I haven't had to do it to anything I currently own. I hope I don't have to. Link to comment Share on other sites More sharing options...
PFitz Posted December 14, 2017 Share Posted December 14, 2017 Whenever adding an electric fuel pump, if it's not the same pressure as the original mechanical pump, the fuel pressure change will also change the carb's float level. The float level is more critical than most car owners realize. A properly rebuilt mechanical pump will last a life time and it is the correct fuel PSI for that carb. So, here's another vote for rebuild the mechanical and use the electric as a primer pump. Paul Link to comment Share on other sites More sharing options...
dictator27 Posted December 14, 2017 Share Posted December 14, 2017 13 hours ago, JFranklin said: I saw an engine that blew up due to a similar problem so be careful. Likewise. An explosion in the oil pan caused by a leaking fuel pump blew both rocker covers off the engine. Link to comment Share on other sites More sharing options...
JACK M Posted December 14, 2017 Share Posted December 14, 2017 2 hours ago, dictator27 said: Likewise. An explosion in the oil pan caused by a leaking fuel pump blew both rocker covers off the engine. Not to mention oil pan gaskets etc. Link to comment Share on other sites More sharing options...
ArticiferTom Posted December 14, 2017 Share Posted December 14, 2017 If diaphragm is leaking there will be gas leaking out bottom of pump also . As there is a hole to atmosphere to permit pump functioning . Is it down draft carb , flooding ? Link to comment Share on other sites More sharing options...
old car fan Posted December 14, 2017 Share Posted December 14, 2017 You do not need a electric pump,Unless you are collecting insurance for a car fire. Link to comment Share on other sites More sharing options...
Rusty_OToole Posted December 16, 2017 Share Posted December 16, 2017 Just get the stock pump rebuilt and forget the electric. If you MUST have an electric pump wire it through a switch and use it sparingly, for easier starting and in case of vapor lock, do not use all the time. Link to comment Share on other sites More sharing options...
Marty Roth Posted December 17, 2017 Share Posted December 17, 2017 Fuel Pump Diaphragm allows fuel to pass into engine, settling in oil pan- IT HAPPENED TO MY 1977 SUBURBAN - NEXT MORNING IT EXPLODED, 7:00 AM on a Sunday TORE OFF THE ROCKER COVERS AND OIL PAN Neighbors thought I was doing business with the wrong people Link to comment Share on other sites More sharing options...
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