Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 
Like Tree1Likes

Thread: 302 fuel pump eccentric
          
   
   

Reply To Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 16
  1. #1
    mreed1's Avatar
    mreed1 is offline CHR Member Visit my Photo Gallery
    Join Date
    Apr 2014
    Location
    kansas city
    Posts
    5

    302 fuel pump eccentric

     



    Are these prone to breaking? Car ran fine then no fuel to carb. Feels like eccentric is turning freely in timing cover. common problem?

  2. #2
    34_40's Avatar
    34_40 is offline CHR Member Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    New Bedford
    Car Year, Make, Model: 34 Ford 3W Coupe Replica
    Posts
    14,605

    I wouldn't say common. Out of the millions on the road, I've only known of 1 that had a problem, to a guy that used to be on here.

    I've seen more fuel pumps fail than the eccentric. But others will offer their opinions too. Can you shine a light inside and with a mirror look and see if the eccentric is moving while someone spins the motor over with the starter?

  3. #3
    cffisher's Avatar
    cffisher is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2006
    Location
    Constantine
    Car Year, Make, Model: 57 chevy 2 dr wagon
    Posts
    9,476

    I have seen Chevy's cam eccentric go bad but not very often the cure was always an electric fuel pump
    Charlie
    Lovin' what I do and doing what I love
    Some guys can fix broken NO ONE can fix STUPID
    W8AMR
    http://fishertrains94.webs.com/
    Christian in training

  4. #4
    34_40's Avatar
    34_40 is offline CHR Member Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    New Bedford
    Car Year, Make, Model: 34 Ford 3W Coupe Replica
    Posts
    14,605

    If I remembered right, the one that failed on 1 of our members, was a stamped unit and it has a tang off of it that fits into the cam to provide positive rotation. His had the tang break I think, the stronger one has a hardened pin instead of the stamped tang.

    The downside in proving this, is you must pull the timing chain cover.

  5. #5
    rspears's Avatar
    rspears is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    Gardner, KS
    Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
    Posts
    10,979

    I remembered the long discussion by DaveW but not the details of what he found so I did a search and was amazed that it WORKED!!

    Here's a link to the post where he showed a picture of the stamped steel eccentric with the little tab broken off - Embarrassing trip today

    Sure wish DaveW would come back.....
    34_40 likes this.
    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

  6. #6
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2006
    Location
    Bartlett
    Posts
    6,831

    there are two different eccentrics used---one is one piece and the other two pieces--the 2 pc one outer portion will/should rotate freely---


    you need to remove the front cover to insure that its not caused by loose bolt in the camshaft--------

  7. #7
    mreed1's Avatar
    mreed1 is offline CHR Member Visit my Photo Gallery
    Join Date
    Apr 2014
    Location
    kansas city
    Posts
    5

    Thanks guy's. Checked all other possibilities, glogged lines etc. can only assume it's time to pull the cover.
    Even the brand new fuel pump arm did not show any wear marks after cranking the engine for awhile.
    New to the forum and loving it already, thanks again.

  8. #8
    34_40's Avatar
    34_40 is offline CHR Member Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    New Bedford
    Car Year, Make, Model: 34 Ford 3W Coupe Replica
    Posts
    14,605

    Glad you enjoying it here! We enjoy seeing you! Once you've gone past the "trial period" (10 posts reportedly) and we get to know you aren't a spammer, feel free to share some pics. I'm hoping that ailing SBF is in your avatar vehicle..

    If you need a eccentric, I may have a good used one if you want it.

  9. #9
    mreed1's Avatar
    mreed1 is offline CHR Member Visit my Photo Gallery
    Join Date
    Apr 2014
    Location
    kansas city
    Posts
    5

    Maybe you can help me with the diagnosis. I can get a fingertip on the eccentric and it does turn but there does not appear to be any slop in it. I have tried the pump hooked directly to a gas can but still no suction.
    Any ideas?

  10. #10
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2006
    Location
    Bartlett
    Posts
    6,831

    1. blow backwards thru the fuel line to make sure line isn't plugged ( maybe first pressurize tank to see if fuel flows forward, then blow backwards if it doesn't)

  11. #11
    rspears's Avatar
    rspears is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    Gardner, KS
    Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
    Posts
    10,979

    Quote Originally Posted by jerry clayton View Post
    1. blow backwards thru the fuel line to make sure line isn't plugged ( maybe first pressurize tank to see if fuel flows forward, then blow backwards if it doesn't)
    Jerry's on target to check the line. A friend having trouble with fuel supply replaced the in-tank pump only to find that his braided SS line from tank to engine was "weeping" along the length, so he replaced all of the line and rebuilt the carb. Ethanol had done a job on all the flexible parts.
    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

  12. #12
    mreed1's Avatar
    mreed1 is offline CHR Member Visit my Photo Gallery
    Join Date
    Apr 2014
    Location
    kansas city
    Posts
    5

    big question is, should the outer eccentric turn with my fingertip if it is a 2 piece?

  13. #13
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2006
    Location
    Bartlett
    Posts
    6,831

    read post #6

  14. #14
    rspears's Avatar
    rspears is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Sep 2007
    Location
    Gardner, KS
    Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
    Posts
    10,979

    mreed1, you don't say if this is an engine that's been fine for a long time, and all of a sudden developed this problem or if there were changes made to the engine, and now you've got a problem. One thing I've seen mentioned is that many of the 5.0's were EFI, and when converted to a carb the eccentric is added but the pin in the cam is not changed. The pin for the mechanical fuel pump application is about 3/16" longer to extend out well past the surface of the eccentric. If the shorter pin was left in there it's common for the eccentric to "jump" the pin and cause loss of fuel, and it may "grab" occasionally making it a sporadic problem.
    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

  15. #15
    mreed1's Avatar
    mreed1 is offline CHR Member Visit my Photo Gallery
    Join Date
    Apr 2014
    Location
    kansas city
    Posts
    5

    ran fine for 3-4 years, no changes made, just wouldnt start one day. no fuel to carb, all lines clean, new fuel pump bot cannot say if it was ever converted earlier in life. Thanks again for your help

Reply To Thread
Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink