1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Sputtering again

Discussion in 'Early CJ5 and CJ6 Tech' started by dauntless_powered, Mar 17, 2010.

  1. Mar 26, 2010
    kaiser_willys

    kaiser_willys Well-Known Member

    Joined:
    Jan 7, 2007
    Messages:
    1,524
    this is true, but if it has just started and has not burned the valve YET, it will hold that valve open more as the temputare rises, EVENTUALLY causing a burned valve that will cause a loss of power all the time. just check out the basics after all its just a over grown lawn mower engine, if you can fix a lawn mower engine you can fix one of these just more cylinders;) 3 things to check ignition, fuel delievery, compression:beer:
     
  2. Mar 26, 2010
    dauntless_powered

    dauntless_powered SUB Chief Sponsor

    Groton, CT
    Joined:
    Nov 3, 2003
    Messages:
    1,000,069
    Steve,

    Sweet tool, I really do not think the tank has crud, but I have been wrong so many times before. I am going to test fuel pressure tonight, I have never used my vac/fuel pressure tester for fuel pump pressure before so I guess now is a good as time as any, where is the best place to test it usually?
     
  3. Mar 26, 2010
    Walt Couch

    Walt Couch sidehill Cordele, Ga. Sponsor 2019 Sponsor

    cordele, Ga.
    Joined:
    Mar 29, 2007
    Messages:
    5,403
    Note that electric fuel pumps tend to loose prime if they are mounted horizontal. Must be vertical or no more than a 45* angle. The output nozzle has to be above the inlet nozzle and some electric fuel pumps have an internal filter.
     
  4. Mar 26, 2010
    dauntless_powered

    dauntless_powered SUB Chief Sponsor

    Groton, CT
    Joined:
    Nov 3, 2003
    Messages:
    1,000,069
    Ok, so the fuel pump is mounted inside the frame rail inline between the carb and fuel filter. It seems to be a cheepo type summit unit installed from the PO. at the carb inlet I have around 4.5/4.75 psi according to my pressure gauge. According to the manual (not taking into factor the solex) it should be no more than 3.5psi. Could this have caused an issue internal to the carb over a little bit of time that could lead to my initial problem?
     
  5. Mar 27, 2010
    w3srl

    w3srl Jeepless in Pittsburgh Staff Member Sponsor

    Pittsburgh, PA
    Joined:
    Nov 6, 2002
    Messages:
    3,958
    Too much fuel pressure usually causes a flooding condition, since it tends to keep the needle up off the seat. An inexpensive fuel pressure regulator right at the carb inlet would be a good place to start. You coul dprobably get away with hiding it down by the fuel pump as long as you get it set to deliver 2-3 PSI at the carb inlet.

    Also, can you see if there is an internal filter in the pump anywhere?

    If I'm reading your post correctly the inline filter is between the pump and the tank; the filter should really be between the pump and the regulator since it is far easier to push fuel than to pull it. Electric pumps especially don't have a lot of suction power, they are far better at producing pressure.

    Here's an el-cheapo unit by Mr. Gasket, they run about 20 bux:

    [​IMG]
     
  6. Mar 27, 2010
    dauntless_powered

    dauntless_powered SUB Chief Sponsor

    Groton, CT
    Joined:
    Nov 3, 2003
    Messages:
    1,000,069
    Steve, yeah the setup goes Tank---->Inline Filter---->el cheepo fuel pump (unsure on interior filter)---->carb. I will see what I can find for a regulator. If this is the issue then why was it ok for awhile then crap again, wouldn't there have been an issue a soon as the po installed the pump?
     
  7. Mar 27, 2010
    w3srl

    w3srl Jeepless in Pittsburgh Staff Member Sponsor

    Pittsburgh, PA
    Joined:
    Nov 6, 2002
    Messages:
    3,958
    Maybe, maybe not. I'm just thinking that something along the way may be hanging on the ragged edge. Sometimes these things aren't caused by a single thing, but a combination of two or more factors that add up. All you can do is eliminate the possibilities one by one until you find it.
     
  8. Mar 27, 2010
    dauntless_powered

    dauntless_powered SUB Chief Sponsor

    Groton, CT
    Joined:
    Nov 3, 2003
    Messages:
    1,000,069
    I hear ya, I have one plug that looks diff than the rest so I am going to change plugs out and put a new wire on that cyl, also going to take a very close look at the fuel lines ie replacing most of them just cause I can, but since I am getting 4.5psi at the carb I can assume the pump is free and clear at least I would assume. Also I am going to pull the top of the carb off and see what that looks like. Will report back later today or tomorrow with my findings
     
  9. Mar 27, 2010
    Patrick

    Patrick Super Moderator Staff Member Sponsor

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,364
    If it were me.....I'd just put a mechanical back on it.
     
  10. Mar 27, 2010
    dauntless_powered

    dauntless_powered SUB Chief Sponsor

    Groton, CT
    Joined:
    Nov 3, 2003
    Messages:
    1,000,069
    I agree, I gotta find one that is oem like.... The glass bowl style is still installed on my jeep but the po just closed looped it onitself. Not sure the condition of it at all but it def needs to be cleaned
     
  11. Mar 27, 2010
    Patrick

    Patrick Super Moderator Staff Member Sponsor

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,364
    It probably quit working. Not sure why else someone would bypass it and install an electric.
     
  12. Mar 27, 2010
    tcfeet

    tcfeet Member

    east of west,...
    Joined:
    May 30, 2009
    Messages:
    294
    If you have a solex on there, You might want to
    find out what pressure they recomend.
    I just put a solex on my f134 and they said
    1 3/4-2 lbs. Seems low but it runs great .
    Hope you get it going soon.
    Tom:?
     
  13. Mar 27, 2010
    dauntless_powered

    dauntless_powered SUB Chief Sponsor

    Groton, CT
    Joined:
    Nov 3, 2003
    Messages:
    1,000,069
    Well, I will be a SOB....new plug wire on the cyl that looked a touch off and BINGO!!!!! purrs like a goshdamn kitten! Nice little difference the pertronix makes now that I can tell :D Time for a cold one after a cold drive
     
    Last edited: Mar 27, 2010
  14. Mar 27, 2010
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
    Joined:
    Dec 30, 2004
    Messages:
    606
    I've got a new one for sale.
     
  15. Mar 27, 2010
    Patrick

    Patrick Super Moderator Staff Member Sponsor

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,364
    Nice!
     
  16. Mar 27, 2010
    w3srl

    w3srl Jeepless in Pittsburgh Staff Member Sponsor

    Pittsburgh, PA
    Joined:
    Nov 6, 2002
    Messages:
    3,958
    I know the feeling. I spent 3+ hours chasing electjuictical gremlins in a firetruck last night only to find that a bad mechanical flasher unit was causing all the grief. Why there are THREE flashers in the turn signal circuit is beyond me, but at least it all works again.

    Glad you got it all sorted out Erik! :beer: :beer: :beer:
     
  17. Mar 27, 2010
    dnb5853

    dnb5853 Member Sponsor 2019 Sponsor

    SLC, UT
    Joined:
    Aug 13, 2006
    Messages:
    594
    Hallelujah!
     
  18. Mar 27, 2010
    dauntless_powered

    dauntless_powered SUB Chief Sponsor

    Groton, CT
    Joined:
    Nov 3, 2003
    Messages:
    1,000,069
    I hear that man, couple weeks ago I chased a strobe problem all to find out that some jackass installed an inline fuse that was hidden and not in the diagrams
     
  19. Mar 27, 2010
    Walt Couch

    Walt Couch sidehill Cordele, Ga. Sponsor 2019 Sponsor

    cordele, Ga.
    Joined:
    Mar 29, 2007
    Messages:
    5,403
    Good to hear it's back on the road.
     
  20. Mar 28, 2010
    panzer

    panzer Super Mod Staff Member Sponsor

    Columbus, OH
    Joined:
    Dec 9, 2003
    Messages:
    1,242
    Outstanding Erik!! Way to go.
     

Share This Page

New Posts