Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

Cummins N14 boosting the power/filter vac #'s

Discussion in 'Trucks [ Eighteen Wheelers ]' started by zx150, Oct 16, 2016.

Page 4 of 7
  1. Dec 2, 2016 #31
    062

    062 Road Train Member

    6,203
    33,416
    Oct 20, 2013
    0
    Like shooterk2 said,if you didn't replace that o-ring that could be your new problem. For the other it could be the shutoff solenoid that's restricting the fuel. If you have a piece of scrap steel handy you can make a block off plate to put in place of the solenoid. You'll need a large o-ring to sandwich between pump and plate.Then you'll know if that's your problem. Of course you'll have to choke the motor off,either block the air intake or kill it in gear.
     
    062, Dec 2, 2016
    062, Dec 2, 2016
    #31
    zx150 and ShooterK2 Thank this.
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Dec 2, 2016 #32
    zx150

    zx150 Medium Load Member

    343
    45
    Mar 30, 2012
    0
    It's gotta be the o ring, slight leak at the cap. Ordered the parts.

    I'll take a look at the solenoid, LOTS of scrap steel handy. I replaced the red part that the power goes to already.

    One thing I'm not sure if I've mentioned or not. The #'s spike on deceleration and while on the Jake. Is that significant?
     
    zx150, Dec 2, 2016
    zx150, Dec 2, 2016
    #32
  4. Dec 2, 2016 #33
    pup

    pup Light Load Member

    252
    256
    Dec 3, 2011
    n.h.
    0
    Restriction #'s increasing during decel & engine braking is normal. Do you have the spin on filter or a davco? The Davco has a check valve at the fuel inlet. It's a great trap for debris.
     
    pup, Dec 2, 2016
    pup, Dec 2, 2016
    #33
    zx150 Thanks this.
  5. Dec 16, 2016 #34
    zx150

    zx150 Medium Load Member

    343
    45
    Mar 30, 2012
    0
    IMAG3046.jpg I have both the spin on and a Davco.

    Installed the new cap, screen, spring and O ring. No more wiggly needle on the restriction gauge. Looks like Cummins had enough complaints about the cap because the replacement has a hex nut on the top instead of a Flathead screwdriver slot.

    Definitely pulls ever so slightly better with the new cap and screen than it ever did with the unmolested old one. Restriction gauge reads 6" at idle and 10" while on the throttle.

    I'm going to replumb my fuel lines and relocate the Davco so it's down low instead of above the fuel tank on the back of the sleeper and minimize the length of fuel lines. Immediately after that we are going to have the pump tested. Maybe it's the problem now and starting to go? Ever since the new screen and cap went in the truck stalls out when started (if sitting over night) unless you give it a little fuel. It will immediately restart on the first try if you don't give it fuel. Engine coughs a bit in the upper RPM's while revved at idle.

    Should the return fuel flow to the tank be a steady flow or a regular spurting? Had the cap off while it's running and the return flow is spurting back to the tank. Not sure if this is normal or not on the N14. My CAT3406B has a steady flow going back. IMAG3046.jpg IMAG3234.jpg IMAG3229.jpg
     
    zx150, Dec 16, 2016
    zx150, Dec 16, 2016
    #34
  7. Dec 16, 2016 #35
    pup

    pup Light Load Member

    252
    256
    Dec 3, 2011
    n.h.
    0
    If the engine has a pump mounted spin on filter you don't need the Davco. Your restriction #s are high if the filters are new. The 2 filters & associated plumbing can cause those high #s. Use a 10 micron filter on the pump. Fleetguard fs1000 is the correct filter for that application. I would ditch the davco & eliminate any hoses you don't need. As to the return flow, It may be spurting due to the splitter valve in the return line. I wouldn't worry about that at this point, I'd get the fuel restriction #s down.
     
    pup, Dec 16, 2016
    pup, Dec 16, 2016
    #35
    zx150 Thanks this.
  8. Dec 17, 2016 #36
    zx150

    zx150 Medium Load Member

    343
    45
    Mar 30, 2012
    0
    IMAG3047.jpg

    This is the OE setup. The Davco is there primarily to keep junk out of the ECM cooler plate.
     
    zx150, Dec 17, 2016
    zx150, Dec 17, 2016
    #36
  9. Dec 17, 2016 #37
    pup

    pup Light Load Member

    252
    256
    Dec 3, 2011
    n.h.
    0
    You still don't need the Davco. The only thing that will trap debris in the cooler plate is the outlet check valve. If your tanks don't have a bunch of crap in them you'll be ok. The restriction guage will show if the check valve is getting packed. The FS1000 is all you need.
     
    pup, Dec 17, 2016
    pup, Dec 17, 2016
    #37
    zx150 Thanks this.
  10. Dec 18, 2016 #38
    jamespmack

    jamespmack Road Train Member

    19,971
    215,554
    Mar 25, 2014
    OH
    0
    ok well you have worked on this long enough. First I would leave the davao in place but you will want a very free flowing filter in it. It is the Primary. Like the 25 micron. Then were you have the BF957. You Should halve a BF 1259. The 1259 is longer may need to move filter head. When you change spin on look at bottom of filter head for cracks. This is common and cheap problem. The crack and suck air.
    Then stop fighting this and check fuel pressure at the pump.
     
    jamespmack, Dec 18, 2016
    jamespmack, Dec 18, 2016
    #38
    zx150 Thanks this.
  11. Dec 18, 2016 #39
    pup

    pup Light Load Member

    252
    256
    Dec 3, 2011
    n.h.
    0
    If you like the Davco you could leave it in place & remove the spin on. Either way would work fine. Use a 10 micron filter. The Davco is easy to monitor & can be set up to heat the fuel. That engine doesn't require 2 filters. Your restriction #s are high due to the 2 filters & plumbing.
     
    pup, Dec 18, 2016
    pup, Dec 18, 2016
    #39
    zx150 Thanks this.
  12. Dec 19, 2016 #40
    jamespmack

    jamespmack Road Train Member

    19,971
    215,554
    Mar 25, 2014
    OH
    0
    When was valves and inj adjusted last?
     
    jamespmack, Dec 19, 2016
    jamespmack, Dec 19, 2016
    #40
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

    • Page 4 of 7