Jump to content


Icon Welcome to the FMCA Motorhome Forums!

Register now to gain access to all of our features. Once registered and signed in, you will be able to create topics; post replies to existing topics; upload pictures; manage your profile; get your own private messenger; create blogs; and more. Sign up now! Already have an account? Sign in. This message will be removed once you are signed in.


Photo
- - - - -

Cummins ISC Cold Fuel Leak


  • Please log in to reply
4 replies to this topic

#1 KURTDEN

KURTDEN

    Newbie

  • Members
  • Pip
  • 4 posts
  • Location:CAVE CREEK, AZ
  • I travel:With Pets

Posted 23 December 2012 - 07:22 AM

I have a Cummins ISC 350.

When it's cold it has a small fuel leak. After it warms up the leak stops. Any ideas what the problem could be.
  • 0

#2 DickandLois

DickandLois

    Advanced Member

  • Members
  • PipPipPip
  • 1,555 posts
  • Location:Where ever the wheels stop ?

Posted 23 December 2012 - 08:33 AM

It sounds like a seal issue, but could you tell us where the leak is located. Fuel filter, fuel line, fuel pump area? Thinking the leak is in / or on the low pressure side of the fuel system if it seals up when the engine warms up. The other possibility is a leak in the fuel return path.

Rich.
  • 0

#3 peterdube

peterdube

    Newbie

  • Members
  • Pip
  • 8 posts

Posted 25 December 2012 - 10:03 AM

I have a 330 ISC My lift pump did this.It left a spot in the driveway the size of a half dollar. It's an easy fix.Just tighten the 3 1/4" bolts 3/8 of a turn and problem solved!!! Use a 7/16 sprocket with an extension. Can all be done from top of engine. Should take 20 min. Very easy fix!!!!!!!!!!!!!!!!

GOOD LUCK

Peter from Maine
  • 0

#4 KURTDEN

KURTDEN

    Newbie

  • Members
  • Pip
  • 4 posts
  • Location:CAVE CREEK, AZ
  • I travel:With Pets

Posted 26 December 2012 - 08:02 AM

Thanks, I'll give that a try.

Kurt
  • 0

#5 KURTDEN

KURTDEN

    Newbie

  • Members
  • Pip
  • 4 posts
  • Location:CAVE CREEK, AZ
  • I travel:With Pets

Posted 29 December 2012 - 09:18 AM

I checked the 3 1/4 bolts on the lift pump, tightened them and have not had any more leaks. Thanks for the very helpful tip.

Kurt
  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users