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Thread: Lost's fuel pump project

  1. #1
    3Geez Veteran lostforawhile's Avatar
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    Lost's fuel pump project

    I was wondering if anyone had added a fuel return line? one of the things you can do with a fuel pressure regulator on a cab setup, is add a return line with a small orifice in it to the incoming fuel line, this always lets a small amount of fuel return to the tank, preventing presssue creep behind the regulator, you just need to make sure the pump has enough capacity to keep the bowls filled plus the very small amount of pressure bleeding off. I was wonding who had added a line to maby do a FI setup, I was wanting to see how the line was routed.
    Last edited by lostforawhile; 03-03-2011 at 06:50 PM.



  2. #2

    Dr_Snooz's Avatar
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    Re: anyone added a fuel return line?

    Hehehehehe! You said "orifice." Hehehehe hehehe hehe heheheheheh!
    Dr_Snooz

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  3. #3
    3Geez Veteran lostforawhile's Avatar
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    Re: anyone added a fuel return line?


  4. #4
    3Geez Veteran lostforawhile's Avatar
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    Re: anyone added a fuel return line?

    I decided to use a facet pump, I guess i could add the return line right after the pressure side of the pump, basically what it is ,is a fitting brazed shut, with a 1/32 hole drilled in the braze, this allows a very slow leak of fuel back to the tank, this stops pressure creep from right behind the regulator, i need to find the formula to figure out exactly how big the hole needs to be, but I need to know the demand of fuel at mid throttle to calculate it. Thats going to be hard to figure out
    Last edited by lostforawhile; 03-06-2011 at 07:06 PM.

  5. #5
    3Geez Veteran lostforawhile's Avatar
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    Re: anyone added a fuel return line?

    got my pickup installed in the tank finally, I can't believe the poor quality of the in tank pumps available for this car, I have an original pump on a hanger, and two aftermarket pumps and hangers, and every one is different, hangers are different lengths, the aftermarket pumps look like cheap junk, and they are supposed to all be the same, and don't get me started on the carter pumps, complete garbage, i had six fail in a row, the counter person at Oreilies told me they discontinued the brand,so many came back, It's a little tough to find a low pressure in tank pump, at least a quality one. I'm just going to install a good facet pump under the car. This is my hanger I created to replace the pump,


    I'm going to create a bypass to let a small amount of fuel cycle back to the tank, This prevents fuel pressure creep behind the regulator, I ended up drilling out the rivet holding in the old electrical connector, and drilled and tapped for 1/8 npt, pretty heavy material in this hanger, and installed a 1/8 to -4 right angle. I have a fitting i made that is brazed up with a 1/32 hole drilled through the braze, this allows a controlled amount of fuel to cycle back to the tank


    Last edited by lostforawhile; 03-06-2011 at 07:07 PM.

  6. #6
    3Geez Veteran lostforawhile's Avatar
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    Re: anyone added a fuel return line?

    I've been under the back end of the car the last two hours, I had to make some templates, I need to fit the fuel filter and pump under there somehow,I have the Facet pump coming, I now have a car sponsor, long story....





    Last edited by lostforawhile; 03-06-2011 at 07:09 PM.

  7. #7
    3Geez Veteran lostforawhile's Avatar
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    Re: anyone added a fuel return line?

    I'm waiting for my facet pump to get here, I borrowed one from work which is identical to the one I ordered, This is the plate with the filter and pump, I'm using three exisiting unused threaded holes on the frame rail to bolt this to.

    pattern transferred to steel plate

    I use 3M vhb tape to hold the patten for marking the plate




    Last edited by lostforawhile; 03-06-2011 at 07:10 PM.

  8. #8
    3Geez Veteran lostforawhile's Avatar
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    Re: anyone added a fuel return line?

    well this is what my new pump will look like, It should be here in a couple of days



    this is what it looks like under the car, I finally figured out how to run the lines to hook everything up, i'm just waiting on a fitting. I still need to make a stone guard for the pump




    Last edited by lostforawhile; 03-06-2011 at 07:11 PM.

  9. #9
    3Geez Veteran lostforawhile's Avatar
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    Re: anyone added a fuel return line?

    I got more done on the fuel pump, I wanted to add something to protect the pump and filter from flying road debris,

    these are the end brackets, I already had cut them, and drilled and tapped them



    the finished bracket


    milling the support brackets



    bottom plate










    I'm still waiting on some fittings to come in, as well as the actual pump, should be here tomorrow
    Last edited by lostforawhile; 03-06-2011 at 07:12 PM.

  10. #10

    Vanilla Sky's Avatar
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    Re: anyone added a fuel return line?

    You know, this is searchable. The LXi has a return.

  11. #11
    LX User 1813mdw's Avatar
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    Re: anyone added a fuel return line?

    Lostforawhile wouldn't be Lostforawhile if he didn't fab it all up his own way. nice work, bud

  12. #12
    3Geez Veteran lostforawhile's Avatar
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    Re: anyone added a fuel return line?

    Quote Originally Posted by Vanilla Sky View Post
    You know, this is searchable. The LXi has a return.
    i started this as one thread, I think I'm going to change the title and have this moved to the projects forum as a new fuel pump thread instead, I'm aware the LXI has it's own fuel return line, but i was wondering about who had done their own

  13. #13
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project

    This was going to be the side cover, but I left it on my bench at the house this morning, doh, so i started over.


    This is the new cover, I already put the hole in the center of it on the mill. The hole is needed to clear the bolts on the filter



    while deburring the hole, I decided it was a good time to give blood,



    I needed something to cover the hole, ( the cover hole, not the hole in my thumb) so I used an old wheel hub,






    continued.............
    Last edited by lostforawhile; 03-06-2011 at 07:13 PM.

  14. #14
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project





    of course it needs paint, other then the center cap, and i need to finish putting the rivets in the lower bracket, but it all fits. I think this will protect the pump and filter well



    Last edited by lostforawhile; 03-06-2011 at 07:14 PM.

  15. #15
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project

    went out there, cranked up bluesville on the big speakers in the loft and did some more. The new pump should be here tomorrow, the fitting from Summit already made it here.





    Last edited by lostforawhile; 03-06-2011 at 07:15 PM.

  16. #16
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project

    The pump got here today, looks good, I'm baking the pieces of the bracketry right now, and getting ready to put them back together, pictures up in a bit

  17. #17
    SEi User turabaka's Avatar
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    Re: Lost's fuel pump project

    What would it take to get you to make one of those pump hanger inserts for me? It looks clean as hell.
    Lostforawhile:we have to pick on him he's CAH he spray painted himself into this corner with the accord.

  18. #18
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project

    Quote Originally Posted by turabaka View Post
    What would it take to get you to make one of those pump hanger inserts for me? It looks clean as hell.
    i'll have to see if I have any more of the wide aluminum stock

  19. #19
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project






    Last edited by lostforawhile; 03-06-2011 at 07:15 PM.

  20. #20
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project

    I bolted up everything, and everything clears.







    this was the original filter bracket before I got the pump and built this one

    Last edited by lostforawhile; 03-06-2011 at 09:42 PM.

  21. #21

    Ichiban's Avatar
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    Re: Lost's fuel pump project

    Woah, your original pump mounting was way far and above what I've got. The new setup looks like it came from inside a computer or something.

    I like the hole saw in the mill. I've only got 2 manual mills with drills up to 3.5" dia, and a Haas VF-7, monstrous table, run by Mastercam.

    Back to the fuel pump, I just Pico clamped mine to the bottom of the car, but the biggest pico clamps weren't big enough, so I used a couple joined together with a bolt and nut. Since the pump body itself rests against the bottom of the car, it's loud as hell. Pump comes on, you hear it. But that's an EFI pump. I also used cheap fittings, brass double flare and high pressure style fuel line clamps with brass hose barbs.
    ICHIBAN!
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  22. #22
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project

    Quote Originally Posted by Ichiban View Post
    Woah, your original pump mounting was way far and above what I've got. The new setup looks like it came from inside a computer or something.

    I like the hole saw in the mill. I've only got 2 manual mills with drills up to 3.5" dia, and a Haas VF-7, monstrous table, run by Mastercam.

    Back to the fuel pump, I just Pico clamped mine to the bottom of the car, but the biggest pico clamps weren't big enough, so I used a couple joined together with a bolt and nut. Since the pump body itself rests against the bottom of the car, it's loud as hell. Pump comes on, you hear it. But that's an EFI pump. I also used cheap fittings, brass double flare and high pressure style fuel line clamps with brass hose barbs.
    I used the mill with the hole saw, because I can run it in back gear and slow the saw way down, the sound of a hole saw on high speed on thin aluminum is a sound heard all over the plant. I just drilled three holes in the piece, screwed it to a 2/4 and clamped that in the mill. I drilled the 1/4 inch hole on center on the drill press, the center on the hole saw is just a 1/4 round pin. We do a lot of the hole drilling like that, aluminum,stainless, etc. the cage around the pump is to protect it from flying road debris, I may install some rubber washers on both sides of the pump feet, I just remembered we use these pumps as transfer pumps in the wings, and they are LOUD!! mostly resonance on the metal
    Last edited by lostforawhile; 03-06-2011 at 08:34 PM.

  23. #23
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project

    I was searching for info on the facet pumps, and I found a thread on prelude power, apparently the 2nd gen lude guys have been using them for a while, and have had good luck . this particular pump is recommended for use with webbers

  24. #24
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project

    Quote Originally Posted by yaohua View Post
    That is a efi pump. I also use cheap fittings, copper double flare high pressure in the fuel line with copper clamp style hose corresponds..
    stupid bots i also up shove reply your ass, go sell some nigerian lottery tickets or something
    Last edited by lostforawhile; 09-18-2011 at 10:00 PM.

  25. #25
    3Geez Veteran lostforawhile's Avatar
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    Re: Lost's fuel pump project

    a little update, the pump plumbing is done on the pump and fuel filter, I have one of the hardline to AN adapters coming, this allows me to cut off the flare of the hardline where it comes from inside the car, and adapt it straight to AN, I will post a lot of pictures of that when I put it in. A lot of guys are even using these adapters for fuel injection with no issues, I'm working on moving the canister right now, it's probably going to go on the front beam, and I'm going to simplify the carb venting to simple vents to the air cleaners. That means a lot of lines come off of the firewall.


    the pump had to have the lines cross over like this, there simply isn't enough room between the filter and pump otherwise




    canister


    Last edited by lostforawhile; 04-09-2012 at 06:37 PM.

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