LB7: Fuel in Crankcase

[ikeG]

Very little LB7 experience here, but have an 03 that in less than 100 miles driven since oil change, will fill the crankcase with fuel. Just drained approx 5 gallons out and it has around 90 miles on since oil change. I assumed it was injectors; any other ideas or experiences??

 

[catman3126]

bad injector the body of the injector crack and leaks fuel under the valve cover and fills the cranks case. new injectors installed 4K

 

[catman3126]

could be return lines but if nobdy has been into the fuel system under the valve covers most likely an injector body has cracked. you could take the valve covers off put the lines back on on and connect the wiring and start it up and look for leaks. if your luck you can see it and replace the bad one but might as well do them all so you don't have to go back in there down the road.

 

[TLyons90]

Time for injectors! LB7s are notorious for this...

 

[Yellow Jacket]

I've had a handful of trucks do this, can be injectors, but I've also seen banjo bolts for return lines under valve cover come loose, and seen that return line cracked or broken b4 too.

Get upper valve covers off and run it, u will find a leak that bad pretty quick...

 

[02Dmaxdually]

^^^:thumb:

 

[catman3126]

you can buy a complete install kit with everything you need from merchant for 2900-3000 plus a 1200 core which gets refunded or send your too them in advance and then theres now core.

 

[bluecollar]

X2 on what yellow jacket said :thumb:

 

[ikeG]

Obviously i know about the injector isssues but with this amount of fuel in that short of time period, i was hoping someone could shed some light on another possible issue. Thanks guys.

 

[catman3126]

UHHH its either the injector bodies or the lines, no other place for it to come from. what kinda light would you like shined on it lol. the first one I did injectors in the guy told me hill filled up and went to the mountains which was a 45 miles drive and when he got back fuel was coming out fo the crankcase breather tube from the valve cover.....that means the engine was full....too the top!!! and he had checked his oil the day before. he said "man I got back to town and had burnt 3/4 of a tank of diesel that was around 90-100 miles driving.

 

[LB7 Lover 1994]

Injectors for sure bud, I am currently going through the same thing. Mine is in the shop for this very problem right now. If I were you, and I had another means of transportation I would park it until injectors can be done.