84-85 Trucks & 4Runners 2nd gen pickups and 1st gen 4Runners with solid front axles

gas in oil what do I need to check

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Old Apr 23, 2013 | 01:09 PM
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gas in oil what do I need to check

I got gas in my oil so what do I need to check before and start buyin parts? The truck runs great only problems I have are its hard to start and has trouble idleing below 1000rpm but I thought that was in the carb
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Old Apr 23, 2013 | 01:55 PM
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could the mechanical fuel pump that is attached to the head be leaking into it and therefore mixing with the oil
Attached Thumbnails gas in oil what do I need to check-22r_fuel-pump.jpg  

Last edited by 85toy4runner; Apr 23, 2013 at 02:19 PM.
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Old Apr 23, 2013 | 03:21 PM
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That could very well be because you gotta pump the hell outta the gas to start it. Its got a fuel pump on it I've never seen on a Toyota so is this stock?Name:  20130423_182533_zpsfabb346c.jpg
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Old Apr 23, 2013 | 04:57 PM
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yeah, stock mechanical fuel pump on a 22r

its like about $89.37 from toyota online for the fuel pump
part number 23100-39336
but I would call toyota and give them your vin # to be sure that's the right one, and prob get the gaskets to
Attached Thumbnails gas in oil what do I need to check-256183935.png  

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Old Apr 23, 2013 | 07:12 PM
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this is common in mechanical fuel pumps. my 87 dodge did the same thing when i first got it. it was hard to start after it sat a while. the diaphragm that separates the gas from the oil gets small holes in it.

make sure you clean the surfaces well with carb cleaner and to change your oil

and if it isnt that....when was the last time you changed the fuel pump anyway?
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Old Apr 24, 2013 | 02:10 AM
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Originally Posted by maachine
this is common in mechanical fuel pumps. my 87 dodge did the same thing when i first got it. it was hard to start after it sat a while. the diaphragm that separates the gas from the oil gets small holes in it.

make sure you clean the surfaces well with carb cleaner and to change your oil

and if it isnt that....when was the last time you changed the fuel pump anyway?
Only had her since January, so never. And she did sit for a few months before I bought it
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Old Apr 24, 2013 | 06:20 AM
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when i said after it sat a while i meant like 12 hours. if it sat over night it wouldnt start in the morning. had to use starter fluid. but if i started it every couple of hours it would fire right up no problem.

just sharing those symptoms with you so you could compare
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Old Apr 24, 2013 | 12:48 PM
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She dose that too lol sorry man I read thru what you said to fast and didn't get it
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Old Apr 24, 2013 | 12:52 PM
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What surfaces where you talkin about cleanin also?
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Old Apr 24, 2013 | 01:00 PM
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where the new fuel pump mounts to the engine block. just make sure you scrap the old gasket off that surface and give it a wipe down with acetone or carb cleaner. that helps to achieve a good seal

if you have the same symptoms i had, its the fuel pump. you'll be amazed at how well itll start after replacing it. might as well do fuel filter too, if its cheap and easily accessible.
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Old Apr 24, 2013 | 01:04 PM
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If it doesn't end up being the fuel pump, I wonder what would be the next step in trouble shooting the "gas in your oil" problem... Does anyone have any suggestions after the fuel pump?
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Old Apr 24, 2013 | 01:18 PM
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bad piston rings would be my guess. only time gas has a chance of getting into the block is through the mechanical fuel pump, and during the compression stroke. with bad rings it could push the fuel mixture past the rings into the block. but its a air/gas fume at that point, not a liquid. so really i'm not sure to be honest.

wait, if the carb has a stuck needle and seat it could flood liquid gas into your intake which then could get into the block. thats a possibility. but this is my experience with motorcycles and gravity fed fuel systems, doubt it would work the same with an old toyota.

also check your PCV valve to make sure its working properly
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Old May 2, 2013 | 04:55 PM
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ok thanks man best I can tell, my fuel filter got deleted by one of the last owners I planed to put a new one on. But yea its pretty well exactly what you where describing.
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Old May 2, 2013 | 05:39 PM
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The stock filter should be in a little bracket in the right rear wheelwell. Visible under the rubber liner that conceals the body to frame gap. If its not there or anywhere else along the line, then get one soon...
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Old May 3, 2013 | 05:02 PM
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Yea I got one sitting on my dash for it when I take the bed off to do frame repairs and fix the rear brakes it'll be put on. I've been real busy lately and haven't had much time to work on my ole truck. So its been sittin there for a while lol
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Old May 3, 2013 | 05:24 PM
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I had a carb that was running so rich that it was washing the cylinder walls of oil and contaminating the oil with gas,it can and did happen to me with a weber that was not jetted right
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Old May 6, 2013 | 02:32 AM
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Well that could be to becuase when I got it it was hella rich and also wasnt fireing on #4. My dad and I have got it closer to where its supposed to be and fixed the miss since then. Same oil tho. But there's definitely a pre carb issue too

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Old May 6, 2013 | 01:12 PM
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whatever you do change the oil often if gas is in there or keeps getting in there or you will have issues with your rings soon if you keep running it and then its rebuild or swap time.
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Old Jun 3, 2013 | 05:28 PM
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Got her all fixed thanks for the help. I still got some adjusting to do on the carb but as is it will cold start and run but my idle the is to low at the moment
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Old Jun 4, 2013 | 03:36 PM
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fuel pump it was then huh?
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