LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Crankcase filling with gasoline

Thread Tools
 
Search this Thread
 
Old Mar 4, 2013 | 04:04 PM
  #1  
Ryan Posey's Avatar
Thread Starter
Registered User
 
Joined: Mar 2013
Posts: 8
Crankcase filling with gasoline

My car is filling the crankcase with gasoline very quickly. Where is the best place to start trying to diagnose this problem? THANKS
Old Mar 4, 2013 | 04:08 PM
  #2  
Injuneer's Avatar
Administrator
 
Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
Re: Crankcase filling with gasoline

Check the vacuum compensation line from the fuel pressure regulator for wet fuel. Should not be wet.

Does the exhaust smell extremely rich? The injectors could be flooding the cylinders, with the excess fuel bypassing the rings, into the crankcase.
Old Mar 4, 2013 | 04:08 PM
  #3  
KW Baraka's Avatar
Registered User
 
Joined: Jan 2005
Posts: 212
From: San Antonio, Tx
Re: Crankcase filling with gasoline

Either your injectors are spraying waaaaaay too much fuel, or you have cylinders that are not firing.

Check spark plugs for signs of excessive wear/breakage and for fouling.

Also.....scan it while running to determine if all cylinders are firing and check fuel pressure.

KW
Old Mar 4, 2013 | 04:14 PM
  #4  
Ryan Posey's Avatar
Thread Starter
Registered User
 
Joined: Mar 2013
Posts: 8
Re: Crankcase filling with gasoline

ts obdI so i don't have a compatable scan tool. I pulled the rails and injectors out and turned the key on and found no leakers. I have not tried to pop them off and watch them yet.
Old Mar 4, 2013 | 04:16 PM
  #5  
KW Baraka's Avatar
Registered User
 
Joined: Jan 2005
Posts: 212
From: San Antonio, Tx
Re: Crankcase filling with gasoline

Originally Posted by Ryan Posey
........I pulled the rails and injectors out and turned the key on and found no leakers. I have not tried to pop them off and watch them yet.
I'd expect at least one injector being stuck in the open position.....

KW
Old Mar 4, 2013 | 04:17 PM
  #6  
Ryan Posey's Avatar
Thread Starter
Registered User
 
Joined: Mar 2013
Posts: 8
Re: Crankcase filling with gasoline

I did too, however no leaks.
Old Mar 4, 2013 | 04:21 PM
  #7  
Ryan Posey's Avatar
Thread Starter
Registered User
 
Joined: Mar 2013
Posts: 8
Re: Crankcase filling with gasoline

I already pulled vacuum on the regulator and it held.
Old Mar 4, 2013 | 04:22 PM
  #8  
Ryan Posey's Avatar
Thread Starter
Registered User
 
Joined: Mar 2013
Posts: 8
Re: Crankcase filling with gasoline

Also it's a bone stock 1994 model
Old Mar 4, 2013 | 04:24 PM
  #9  
Injuneer's Avatar
Administrator
 
Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
Re: Crankcase filling with gasoline

Check the vacuum line from the EVAP purge solenoid for wet fuel.
Old Mar 4, 2013 | 04:29 PM
  #10  
Ryan Posey's Avatar
Thread Starter
Registered User
 
Joined: Mar 2013
Posts: 8
Re: Crankcase filling with gasoline

evap purge is dry
Old Mar 4, 2013 | 04:41 PM
  #11  
shoebox's Avatar
Registered User
 
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
Re: Crankcase filling with gasoline

Originally Posted by Ryan Posey
ts obdI so i don't have a compatable scan tool. I pulled the rails and injectors out and turned the key on and found no leakers. I have not tried to pop them off and watch them yet.
You need to use the fuel pump prime connector and keep the pump on when you check. When you hit the key and don't start it, the pump only stays on for a couple of seconds. Other factors may be relieving pressure.

If you are getting as much gas in the crankcase as what you are saying, it almost has to be injector or f/p regulator related.
Old Mar 4, 2013 | 04:49 PM
  #12  
Ryan Posey's Avatar
Thread Starter
Registered User
 
Joined: Mar 2013
Posts: 8
Re: Crankcase filling with gasoline

Originally Posted by shoebox
You need to use the fuel pump prime connector and keep the pump on when you check. When you hit the key and don't start it, the pump only stays on for a couple of seconds. Other factors may be relieving pressure.

If you are getting as much gas in the crankcase as what you are saying, it almost has to be injector or f/p regulator related.
ground it or B+ to it?
Old Mar 4, 2013 | 05:14 PM
  #13  
shoebox's Avatar
Registered User
 
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
Re: Crankcase filling with gasoline

+12v
Old Mar 4, 2013 | 06:51 PM
  #14  
Ryan Posey's Avatar
Thread Starter
Registered User
 
Joined: Mar 2013
Posts: 8
Re: Crankcase filling with gasoline

Originally Posted by shoebox
+12v
I pulled the rail and wrapped baggies around each injector. One would work fine for about 6 pulses then it began to spray wildly.
Old Mar 5, 2013 | 12:17 PM
  #15  
KW Baraka's Avatar
Registered User
 
Joined: Jan 2005
Posts: 212
From: San Antonio, Tx
Re: Crankcase filling with gasoline

Originally Posted by ryan posey
i pulled the rail and wrapped baggies around each injector. One would work fine for about 6 pulses then it began to spray wildly.
And there you have it ........

KW
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
94Z28LS1toLT1
General 1967-2002 F-Body Tech
41
Oct 4, 2015 11:28 PM
Pwilson59
South Atlantic
1
Sep 3, 2015 08:47 PM
PFYC
Supporting Vendor Group Purchases and Sales
2
Aug 24, 2015 06:41 AM
alphaauto
Cars For Sale
0
Jul 26, 2015 04:40 PM
RX Speed Works
Supporting Vendor Group Purchases and Sales
0
Jul 24, 2015 02:25 PM




All times are GMT -5. The time now is 08:20 PM.