Ive been noticing that when I check my oil level that it keeps rising and it smells like fuel. I have already replaced my injector seals, I'm wondering if it might be my injectors. When I shut off my car it still has like 38psi on the pressure gauge but like an hour later it's at 0psi. Maybe it could be releasing into the IM and passing the valves and everything, but is that likely?

 

BUMP!!!!

 

It could be or you could have fuel escaping the combustion chamber through your rings.

 

Why is my Fuel pressure dropping when it sits? I thought it was supposed to stay pressurized to ensure easy starts?

 

how would I know if my rings are bad?

 

do a leak down test and and a compression test. the fuel pressure is dropping because it has somewhere to go now, whether it be ur rings or what. and also, i would change ur oil. gas thins it out and it isnt the best for ur bearings.

 

I know the gas in the oil is bad. I'v also been getting alot of carbon build up on my spark plugs. Could i be getting a carbon build up on the valves and the fuel be leaking that way? Also the fuel pressure only drops after the car is off, and I thought it was supposed to be pressured for faster safer starts. I'm going to do a compression test tomorrow so, I guess we'll see. If I do have bad rings, what are my options for the D15b rings?

 

u are correct, your fuel system should stay pressurized. thats why i am saying the obvious that you already know, you are leaking while ur sitting. i dont think it could be the valves, because cars turn off all the time with intake valves open. it is somewhere in your intake mani i am GUESSING that you have the leak. hope this helps and you understand. come on guys, help this man out!

 

Two things to check. Injectors leaking into the intake or fpr leaking into the vacuum line. Even the best rings or valve in the world won't hold back fuel from going into the oil if enough drips into a cylinder.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by snowseeker &raquo;</TD></TR><TR><TD CLASS="quote">Two things to check. Injectors leaking into the intake or fpr leaking into the vacuum line. Even the best rings or valve in the world won't hold back fuel from going into the oil if enough drips into a cylinder.</TD></TR></TABLE>

 

Okay, so I tested my compression and all four cylinders were between 150psi-155psi. So atleast I eliminated that part. How long is the system supposed to stay pressurized after sitting? What do you mean the fpr leaking into the vacc line? Do you mean the small vacc line on top of it?

 

yes the little vaccuum line on top. You should be able to pull it off when the car is running and see if there is any gas coming threw it. Or even just tunr the key to on a few times and see if gas comes out of it.

I have seen some fuel systems drop off pressure as soon as the key is turned off and some hold some pressure even over night.

 

there is not any fuel that comes out of it. It is a B&M command flow and I've only had it for like 4 or 5 months. What about the fuel return being clogged? Is there any way to blow through it or something?

 

BUMP!!

 

No it will hold pressure in the fuel system for quite a while, should actually have pressure a lot longer than an hour I'd say.

Fuel in the crankcase I would first suspect you might have bad piston rings. The injector squirts fuel into the cylinder and the fuel leaks past the bad rings.

Now however some fuel in the oil is normal. That is why they tell you to change your oil before you go in for emissions because that helps for some reason.

But a lot of fuel is not normal.

 

well like I said, I have 155-150 in all four cylinders. It might not be as much fuel as I think but I can still smell some.

 

One of your injectors is leaking/not closing. When the car is off the fuel pressure is pushing the fuel through the injector then it is dripping through the intake valve and then through the rings. This is also why the fuel system is not staying pressurized.

You might (Yes I said might)be able to detect this with a screwdriver, with the car running put the sharp end on the injector and put your ear on the handle. All four should sound the same. If you have one that is quieter than the rest that might be it. If this doesn't work you will have to pull them and have them bench tested.

This happened alot to older carb'ed cars when the float would stick.

 

i just wanted to let you know that the piston rings have nothing to do with the gas in your oil. most piston rings have something called endgap and clearence in the ring lands aroung the ring, therefore gas could leak down through the cylinder into the crankcase on a 100% healthy engine. if the rings were so bad that the gas was leaking by when running then that cylinder would at least miss at low rpm (under 2000rpm). my guess is that it is an injector.

 

Okay thanks, I'll try the screwdriver thing.