Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

ACDelco EP381 question

Discussion in 'The Engine Bay' started by possum70, Aug 15, 2016.

  1. possum70

    possum70 1/2 ton status Premium Member

    Joined:
    Sep 1, 2004
    Posts:
    189
    Likes Received:
    3
    Location:
    Mebane, NC
    Will the ACDelco EP 381 fit onto my sending unit for a 1978 K5? Or do I need to get a complete unit for another year?

    possum
     
  2. sweetk30

    sweetk30 professional hooker Premium Member

    Joined:
    Nov 1, 2004
    Posts:
    26,059
    Likes Received:
    1,030
    Location:
    horseheads , ny 14845
    the gm electric pumps swap around a lot on senders . but the sender has to have been for a efi intank pump to begin with .

    some guys just get the 87-91 sender and don't run under 1/4 tank others do tank with baffle and sender from 87-91 .

    also if your sender was NON fuel pump efi how would you put the pump on and feed it power ? ? ?
     
  3. MAX89K5

    MAX89K5 1/2 ton status Premium Member

    Joined:
    Apr 24, 2013
    Posts:
    805
    Likes Received:
    104
    Location:
    Pensacola, Florida
    Pretty sure you can get a 87-91 tank for about $120 and a sender for another $80 or so. It will be a direct drop in and no rigging.
     
  4. sweetk30

    sweetk30 professional hooker Premium Member

    Joined:
    Nov 1, 2004
    Posts:
    26,059
    Likes Received:
    1,030
    Location:
    horseheads , ny 14845
    and they will prob try and sell you a sender with pump for tbi . you can get a unloaded sender minus pump just ask .
     
  5. possum70

    possum70 1/2 ton status Premium Member

    Joined:
    Sep 1, 2004
    Posts:
    189
    Likes Received:
    3
    Location:
    Mebane, NC
    If I haven't got the pump but only stock 1978 stuff, what's the best way to go?
     
  6. MAX89K5

    MAX89K5 1/2 ton status Premium Member

    Joined:
    Apr 24, 2013
    Posts:
    805
    Likes Received:
    104
    Location:
    Pensacola, Florida
    You're gonna have to rig it.

    Figure out a way to safely get power to the pump, and don't run it below a 1/4 tank since there is no baffle.

    Not an ideal situation
     
  7. possum70

    possum70 1/2 ton status Premium Member

    Joined:
    Sep 1, 2004
    Posts:
    189
    Likes Received:
    3
    Location:
    Mebane, NC
    What about a 97 Chevy pump and an 88-91 tank?
     
  8. skunked

    skunked in the garage Premium Member GMOTM Winner

    Joined:
    Feb 27, 2013
    Posts:
    7,435
    Likes Received:
    4,593
    Location:
    Placer County CA
    that's a more common approach to this.

    TBI tank with a matching TBI sending unit (25 or 31 gallon) and the delco pump you mentioned.
     
  9. Kay86K5

    Kay86K5 1/2 ton status Premium Member GMOTM Winner

    Joined:
    Mar 9, 2012
    Posts:
    2,122
    Likes Received:
    809
    Location:
    Meridian, ID
    Also you have to think of your fuel lines too. The factory 78 lines are not meant to handle the pressure a 97 pump puts out. There is lots of ways to go about this, but all I can say is when you try and throw stuff together like this with the stuff you have, you end up paying for it later on down the road when you realize you need what has been mentioned anyways. Probably best to just spend the money now and get a new FI tank with baffles (better anyways for vortec pumps so you don't run the pump dry), and the correct sending unit, throw the EP381 in there, and run your lines.
     
    MAX89K5 and skunked like this.
  10. jdot2004

    jdot2004 1/2 ton status Premium Member

    Joined:
    Jul 7, 2015
    Posts:
    136
    Likes Received:
    104
    Location:
    NJ
    Not sure what your going for but for my ls swap I got everything in one package. part number is KIT0367 at rock auto. It comes with new straps, tank, sender and pump for an 87 for $200. I can't use the pump but it was just more convenient and less expensive for me then to piece it together.
     
    Kay86K5 likes this.
  11. skunked

    skunked in the garage Premium Member GMOTM Winner

    Joined:
    Feb 27, 2013
    Posts:
    7,435
    Likes Received:
    4,593
    Location:
    Placer County CA
    yep.

    Here are the metric to 6AN fittings on a TBI sending unit

    [​IMG]

    [​IMG]
     
    NorCalAnthony and Kay86K5 like this.
  12. Kay86K5

    Kay86K5 1/2 ton status Premium Member GMOTM Winner

    Joined:
    Mar 9, 2012
    Posts:
    2,122
    Likes Received:
    809
    Location:
    Meridian, ID
    ^This. Or, if you have a pickup version, I have found out on my crew cab that the saddle tank TBI tanks do not have the threaded fittings on the end of the sender. If you have the Blazer/Burban tank, then it will be as skunked has shown above. If not, you can still get AN tube fittings and sleeves and install them while flaring the tube, then install similar adapters to shown above. Either way, you can still accomplish what you need.

    This has been done many times now, don't try and reinvent the wheel...these methods work
     
    skunked likes this.
  13. skunked

    skunked in the garage Premium Member GMOTM Winner

    Joined:
    Feb 27, 2013
    Posts:
    7,435
    Likes Received:
    4,593
    Location:
    Placer County CA
    looks like he bought a blazer 31 gallon TBI tank and sending unit.
     
  14. jdot2004

    jdot2004 1/2 ton status Premium Member

    Joined:
    Jul 7, 2015
    Posts:
    136
    Likes Received:
    104
    Location:
    NJ
    Yes that is what I bought and for convenience again, I bought a kit that included all the fittings, 25' of fuel line and the filter from Summit (tnk-ls-line-kit) for around $250. I may have overpaid a little for all of that but after shipping from multiple sources it was about the same. I got the walbro 255 pump for mine though. If i got something wrong let me know. I don't want to be passing along bad info.

    ...don't want to install the wrong parts either.
     
  15. skunked

    skunked in the garage Premium Member GMOTM Winner

    Joined:
    Feb 27, 2013
    Posts:
    7,435
    Likes Received:
    4,593
    Location:
    Placer County CA
    you'll probably still need those adapters that I posted above, they're specific metric to AN fittings. I'm not sure what fuel line and fittings you bought but those are 6AN fittings that I posted.
     
  16. jdot2004

    jdot2004 1/2 ton status Premium Member

    Joined:
    Jul 7, 2015
    Posts:
    136
    Likes Received:
    104
    Location:
    NJ
    The kit has the 6AN fittings and the one for the fuel rail. I had a list of part numbers for the russel fittings I would need that I obtained from posts on here and other sites but most of them did not include quantities for the fittings. Before I bought the kit I matched the individual parts to the ones on my list.
     
  17. jdot2004

    jdot2004 1/2 ton status Premium Member

    Joined:
    Jul 7, 2015
    Posts:
    136
    Likes Received:
    104
    Location:
    NJ
    here's the list of parts included

    * Fuel pressure regulator/fuel filter combination
    * 25 ft. of -6 AN twist-lock fuel line
    * Six straight -6 AN straight twist-lock fittings
    * Two 1/4 in. NPT to -6 AN straight fittings
    * Three 3/8 in. female quick-disconnect to -6 AN male fittings
    * 5/16 in. female quick-disconnect to -6 AN male fitting

    I think the two 1/4 in NPT fittings will not work. They are the ones for the sending unit and the kit uses those two for a specific unit. I will have to replace those two with the ones you have pictured. The rest are to work with a single fuel inlet on the engine and the filter provided.
     
    Last edited: Aug 16, 2016
  18. skunked

    skunked in the garage Premium Member GMOTM Winner

    Joined:
    Feb 27, 2013
    Posts:
    7,435
    Likes Received:
    4,593
    Location:
    Placer County CA
    Yeah so you'll need those metric adapters to go from the sending unit to 6AN
     
  19. jdot2004

    jdot2004 1/2 ton status Premium Member

    Joined:
    Jul 7, 2015
    Posts:
    136
    Likes Received:
    104
    Location:
    NJ
    I must have been editing while you were posting.
     
    skunked likes this.
  20. Kay86K5

    Kay86K5 1/2 ton status Premium Member GMOTM Winner

    Joined:
    Mar 9, 2012
    Posts:
    2,122
    Likes Received:
    809
    Location:
    Meridian, ID
    Just for reference as to what I was mentioning above, here is what mine was with the truck saddle tank TBI unit that does not have threaded fittings on the ends like the burban/blazer tanks

    showing the tubes and sleeves with the flaring
    [​IMG]

    showing the adapters hooked up to the sleeves
    [​IMG]

    Now, there are a couple difference versions of these sending units. Some have longer ports that extend past the actual sending unit farther than what you see above. I would recommend if you are going this route to find one of those units (I found one on rock auto). It makes it much easier to cut and flair the line. I actually had to get the different sending unit after this picture above as the only way I was able to flair these lines is to bend them straight up, cut, flair, then bend back down. But in doing so it created a very small crack in the metal at the bend which leaked. Then I found the other sending unit on rock auto that makes it easier to cut/flair (link to that sending unit below). Live and learn with that one, :)

    http://www.rockauto.com/en/moreinfo.php?pk=972608&cc=1166273&jsn=415

    So now my sending unit looks like the above pictures but with the sending unit linked directly above. Don't think you guys are going the same route as me...but knowledge is power, haha
     

Share This Page