Gas in engine oil

[Cory G]

Hi there,

 

So I ride a 18 Sierra 1500 with the 5.3L and keep getting gas in my oil, my high pressure fuel pump let go in March of 2019 (40000kms ish) and was the first time I got gas in the oil, they replaced it and it was good until late December of 2019, I drove 800 kms to home, parked at the restaurant and went to go home and got a bunch of codes, saying that bank was to lean, bank 1 to rich, bank 2 to lean, bank 2 to rich and a open circuit fault code. The truck was in limp mode but got it to the dealership, they found a short to a relay for the hp fuel pump and my crank case filled with gas (same as the last time but now the truck at 69000kms) they tested the O2’s, fuel injectors, injector cycles and such, they all passed the test so they figured the hp fuel pump went, so they replaced it. I then drove not even 3000kms and my truck was doing 33L/100kms downhill at 104km/h, no codes or engine lights. Checked the oil and it was over filled and smelled of gas, brought into the dealership and they said the Intake tube after the MAF was loose causing the engine to over fuel, now not even 2000kms (3 weeks) into the dealership “fixing” the issue, my oil is over filled and smells strong like gasoline. Any ideas on what the issue could be? I don’t want to keep paying for an oil change every 2-3000kms and 100$ deductible for my extended warranty. I know it’s not healthy for the engine and GM Canada won’t do anything about it.. Any ideas as to what the issue might be would be awesome, thanks 

Edited February 1, 2020 by Cory G
Typos

[tlaw91]

Take a picture of your repair orders and post them here

I may be able to deduce what path they’ve been on to make you feel better and then tell you prob what’s going on now. But I need to read the story the tech has been writing to give you an idea.

-Friendly neighborhood GM tech


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