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Old April 2nd, 2006, 02:50 PM   #1
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Default Fuel in the oil?

Is it possible for a mechanical fuel pump to be bad and dump gas into the crankcase??

I pulled my dipstick and had an awful lotta gas in my oil....
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Old April 2nd, 2006, 03:26 PM   #2
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same thing happens with my buggy
does your tank sit higher then your pump if so get a valve so when you arent using it turn the gas off
after i did that no more gas in the oil
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Old April 2nd, 2006, 03:33 PM   #3
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In the technical term of "possible" yes. But I don't really think so. Was it used for really short trips and the engine not particularly warmed up alot? That will make oil reek of gas. I think if it's running rich it will get some gas in the oil.

How much are we talking about though? Like the level on the dipstick was way higher than the full line because of gas added? or did it just stink like hell of gas?
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Old April 2nd, 2006, 03:38 PM   #4
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sounds like a bad diaphram in your fuel pump. Anytime you have alot of unburned fuel in the cylinder, you will get some in your oil. was there anytime recently you were cranking the hell out of this thing, and it didn't start?

That gas left in the cylinders will just go into the crank case.
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Old April 2nd, 2006, 03:46 PM   #5
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Quote:
Originally Posted by clarkstoncracker
sounds like a bad diaphram in your fuel pump. Anytime you have alot of unburned fuel in the cylinder, you will get some in your oil. was there anytime recently you were cranking the hell out of this thing, and it didn't start?

That gas left in the cylinders will just go into the crank case.
yep there was, on 2 occasions over the winter, friggin thing wouldnt start, but the level on the dipstick was higher because of it. Oil looked runny coming out too. Fuel pump is brand new from NAPA, not that it matters, but it has less then 100 miles on it, Im sure its possible the diaphragm could be bad already.

This is a fresh rebuilt 355 with under 100 miles on the whole motor.

right now it wont roll over, i think the BRAND new starter has a bad solenoid
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Old April 2nd, 2006, 06:34 PM   #6
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rip the fuel pump off and check it from the lever side, its most likely the reason you have fuel in th oil. the only other way is to over fill the float bowl while it sits for a long time. it can wipe out the bearings so change out the oil and disconnect the ignition while you crank fresh oil into it. take out the spark plugs if you want to take it really easy on the bottom end.
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Old April 3rd, 2006, 12:09 AM   #7
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Quote:
Originally Posted by jeepfreak81
i think the BRAND new starter has a bad solenoid
Good ol' napa
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Old April 3rd, 2006, 07:13 AM   #8
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Quote:
Originally Posted by Muddinguy
Good ol' napa

Actually I have had good luck with NAPA starters... the fuel pump from NAPA however... is another story... hence why i wouldnt be suprised if it was bad after 100 miles.

this starter is an Autozone unit that i have NOT had good luck with, however I bought it used and continue to use the lifetime warranty

me --> <-- autozone
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Old April 3rd, 2006, 08:57 PM   #9
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Murrays

Carter fuel pumps and Bosch starters
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Old April 5th, 2006, 12:33 PM   #10
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Yeah, pull it off at look at it.


If you had a hard hard start/flooding situation, it can put a surprising amount of gas past the rings if they aren't sealing great.

I had that in my 304, wet ignition - > flooded engine - > washed cylinder walls - > gas in the crankcase - > wiped out my crank bears and valve seals.


I had a 4.0 liter with only 4:1 compression in the #1 cylinder, it did the same thing, filled the crankcase with gas..
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Old April 5th, 2006, 12:47 PM   #11
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So far i have changed the oil and not tried to start it, as I need to change the starter yet... i will crank it with no power to the dist. for a few seconds when i do try to start it to circulate the fresh oil.... is there any other recommendations. The lower end has around 100 miles on it... I REALLY dont want to tear it apart again.
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Old April 6th, 2006, 10:37 PM   #12
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i have the same prob im putting a elct. pump on it.
did you get the motor to hot? that can take out a pump
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Old April 7th, 2006, 09:33 AM   #13
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Have the pump off and it looks fine... Im just hoping water doesnt get in the crankcase with this rain I knew I should have put a rag in the hole.

My uncle wants me to check the carb, says they can leak down when the need a rebuild, but I think that is fine as well. I think I just flooded it terribly.
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Old April 22nd, 2006, 08:05 PM   #14
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What carb are you running? I had the same issue on another vehicle. Figured it was the pump. Ended up being the junk quadrajet carb. ( Wich was a napa rebuilt one installed a month or so before I bought the truck). When I pulled it off fuel was running out of the bottom where the welch plugs were leaking. It would drain the float bowls down in less than a minute.
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Old April 22nd, 2006, 08:20 PM   #15
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Ive heard of both the carbs and pumps problems. Prolly the carb, if the engine is that fresh. And as far as NAPA goes, I buy almost all my parts there. I refuse to support shitty Autozone and especially Advance Asshole Pukes.
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Old April 23rd, 2006, 08:26 AM   #16
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Pretty sure i just flooded it horribly over the winter, maybe the choke wasnt working right. I got a new redtop battery threw it in after the oil change... cranked it a minute to get the oil to the top, turned on the kill switch and fired first try...

It was running on 3.5 cylinders but it was running I had 4 fouled plugs and another that was firing only about 70% of the time.
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