SPONSORED LINKS

When starting gas leaks out of exhaust manifold

Tiny
JARVISCORLEY
  • MEMBER
  • 2000 CHEVROLET 3500
  • 7.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
When I start my truck up, it starts to leak gas out of the passenger side exhaust manifold. I was thinking it is the intake manifold gaskets. So I changed the upper and lower intake exhaust gaskets, but before that I changed the injectors thinking that was my problem. All that I did, did not stop my problem of gas leaking out of the exhaust pipe. The motor runs strong. No missing or back fire.

Can you please help ASAP? Thanks from a man that is mind boggled. Thanks again, Jarvis

SPONSORED LINKS
Wednesday, June 20th, 2018 AT 12:10 AM

6 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

The fuel pressure regulator may be the issue. If it is leaking, it will draw raw fuel into the vacuum system and cause this issue.

Roy

Caution: Refer to Battery Disconnect Caution in Service Precautions.

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to the Fuel Pressure Relief Procedure.
3. Remove the upper intake manifold.
4. Disconnect the vacuum line to the regulator.
5. Remove the snap ring (1) from the pressure regulator housing.
6. Place a towel under the regulator in order to catch any fuel.
7. Remove the fuel pressure regulator (2) from the fuel rail socket. Twist back and forth while pulling from the socket.
8. Remove the pressure regulator small O-ring (6), filter (5), large O-ring (4), and the O-ring backup (3).
9. Discard the O-rings.

Installation procedure:
1. Lubricate the new pressure regulator O-ring s (4) and (6) with clean engine oil.
2. Install the O-ring backup (3), the large O-ring (4), the filter (5), and the small O-ring (6) on the regulator.
3. Install the pressure regulator into the fuel rail housing.
4. Install the snap ring retainer (1) into the slot on the fuel regulator housing.

Important: Verify that the retainer is engaged in the slot in the pressure regulator housing.

5. Grasp and pull on the regulator (2) in order to ensure that it is properly seated.
6. Connect the negative battery cable.
7. Inspect for fuel leaks.
7.1. Turn the ignition switch "on" for two seconds.
7.2. Turn the ignition switch "off" for ten seconds.
7.3. Turn the ignition switch "on".
7.4. Inspect for fuel leaks.
8. Connect the vacuum line to the regulator.
9. Install the upper intake manifold.
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, June 20th, 2018 AT 4:59 AM
Tiny
JARVISCORLEY
  • MEMBER
  • 4 POSTS
Thank you, I will go and buy a new one and see if that is my problem. I will keep you posted.
Was this
answer
helpful?
Yes
No
Wednesday, June 20th, 2018 AT 9:59 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sounds like a plan.

Roy
Was this
answer
helpful?
Yes
No
-1
Wednesday, June 20th, 2018 AT 10:57 AM
Tiny
JARVISCORLEY
  • MEMBER
  • 4 POSTS
Hey Roy. I like to say thank you very much. I changed the fuel pressure regulator and the gas is not leaking out of the exhaust pipe anymore. Thank you very much. If I can. Can I send you some money for telling me what my problem was? Thanks
Was this
answer
helpful?
Yes
No
+1
Wednesday, June 20th, 2018 AT 4:53 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

You using the site is payment enough for us.

Thank you for the offer.

Roy
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, June 20th, 2018 AT 4:57 PM
Tiny
JARVISCORLEY
  • MEMBER
  • 4 POSTS
Thank again. I will definitely share your site with my friends and family.
Was this
answer
helpful?
Yes
No
Wednesday, June 20th, 2018 AT 7:11 PM

Please login or register to post a reply.

Sponsored links