Write up: Gas Tank Relocation

Discussion in 'Exterior' started by Old77, Jan 18, 2011.

  1. Camar068

    Camar068 Supporting Member Supporting Member

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    having issues finding out how much drop between filler and tank. Finally found a few by googling "minimum drop for fuel filler". Yes it's by Ford but I'm sure the theory is the same regardless. Looks like 4° is the minimum. They do mention increasing the size of the vent helping as well.

    https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwidye7gubnWAhWB1CYKHd9oBm8QFggoMAA&url=http://www.askatech.com/AskATechLive/forums/ResourceHandler.ashx?a=8775&usg=AFQjCNHRfjT9i7CpaZXRkP-9yiWgZsPZYA

    Google search:

    https://www.google.com/search?sourc...k1j0i46k1j33i22i29i30k1j33i21k1.0.p9Tgetn7oZM

    put in height and length to figure out angle:

    http://keisan.casio.com/exec/system/1223014436

    Example: A 36" run from the tail light to the center of the bed will require just over 2.5" drop to get the 4°'s needed.

    ALT-0176 is degree symbol for inquiring minds
     
    Last edited: Sep 22, 2017
  2. crazy4offroad

    crazy4offroad Service Bullshit Filter Soon

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    When I filled mine for the first time it took the fuel fine but when it got full it was like a geyser there for a second lol freaked me out, lost a good cup or two of gas. I should probably look into the pitch I have.
     
  3. Camar068

    Camar068 Supporting Member Supporting Member

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    I think the pitch is so it would take it. Do you have the vent line on the filler tube or is it located elsewhere? The size of that tube in either location appears to have an affect on what your describing. Maybe you need a smaller tube to cause it to push back a bit on the inlet to cause it to trip? Guessing there. If you don't care share what size vent hose you have and where it's located. If separate of the filler neck, how far above/below tank it is.

    There's a damn science to this......just not discussed much.
     
  4. crazy4offroad

    crazy4offroad Service Bullshit Filter Soon

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    The vent line is 5/8", same size as what was stock on the saddlebag tank. The vent line ties in to the filler neck really high on the neck, which was different than the stock filler for the saddlebag tank so I thought it would be better higher up. It's literally within an inch of the cap. I guess it's possible gas shot up the vent but hard to tell. The filler neck already had the flap ripped out of it before I got my claws on it. I think there may be a point where the vent line drops below the level of the filler tube that runs behind the rear wheel well but I wouldn't think that would have an effect on it.
     
  5. SDJunkMan

    SDJunkMan Full Access Member

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    Been reading this thread and thinking about a Blazer tank in my short bed. Found a tank with skid plate at the pick a part now just need to figure out the filler. Does anyone have any pics of how they did their filler on a stepside?
     
  6. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Maybe I think they are in here
     
  7. SDJunkMan

    SDJunkMan Full Access Member

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    Looked through the whole thread and only saw smooth sides. Don't think I missed any stepsides.
     
  8. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    671CF87D-357E-4CC0-9C08-2FA95790DD40.jpeg D1FABAD0-74ED-486F-99D6-7381609A0254.jpeg 443C0F2B-EBD3-4635-A21E-8721B3308F17.jpeg C308A599-5A8B-43BE-879E-5336B3F935D8.jpeg 095103E9-11AE-4398-818C-8A7943A9C997.jpeg
     
  9. CSFJ

    CSFJ ----------------- Supporting Member

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    I don't think anyone has addressed it with a stepside yet. It's been on my list of things to figure out, just haven't got to that point in the project yet.
     
  10. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Mine not a stepper I just posted some. Here’s more. 12576FAD-4210-4FE3-B71E-FA55B2E7CE16.jpeg B84096A6-C197-40C3-BDE3-44688D7C15B8.jpeg 19E36551-A335-49B0-9861-A43FF0861844.jpeg
     
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  11. Lostranger

    Lostranger Full Access Member

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    I've never liked the fuel tanks on SBs. This thread has me wondering if the 30 gallon rear tank from my 89 van might fit the 87 R30. I'll at least do some measuring.
     
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  12. Old77

    Old77 Super Moderator Staff Member

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    Let us know what you find :popcorn:
     
  13. Camar068

    Camar068 Supporting Member Supporting Member

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    jump on rockauto and compare the part #'s from a burb of the same year to your vans. If the part #'s are the same.....there you go.
     

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