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Does anyone know the difference between 4.0 and 2.7 fuel pumps?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by JL8Jeff, Dec 1, 2020.

  1. Dec 1, 2020 at 11:55 AM
    #1
    JL8Jeff

    JL8Jeff [OP] Well-Known Member

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    I see there is a different part number for each and I was wondering if there is any difference between the actual pumps in terms of flow.
     
  2. Dec 2, 2020 at 5:22 PM
    #2
    JL8Jeff

    JL8Jeff [OP] Well-Known Member

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    I'm seeing the Denso part numbers for the pump for the 2.7 as 950-0203 as just the pump and for the 4.0 V6 as 950-0210 which also matches the 4.7 V8 fuel pump. I would think the the V6/V8 fuel pump needs to have more volume to feed the extra cylinders and hp but I can't find any real world flow numbers. Some online calculators show around 64 lph for the 4 cyl at 160 hp and 86 lph for the v6 at 215 hp. So my guess would be the V6 fuel pump 950-0210 (v6 pump) or (77020-04061 v6 fuel pump/filter/bucket assembly) flows a bit more than the 2.7 4 cyl 950-0203 (4 cyl pump) or (77020-04071 4 cyl fuel pump/filter/bucket assembly). If anyone has any real world numbers to verify this information it would be great to see or hear about.
     
    Last edited: Dec 2, 2020
  3. Dec 2, 2020 at 6:06 PM
    #3
    TnShooter

    TnShooter The TacomaWorld Stray

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    I don’t know the difference.
    I’d think it wouldn’t make much difference as long as the Fuel Pressure Regulator is working correctly.
    And the pump is capable of creating the correct pressure.

    You might call URD.
    They offer different pumps and combinations.

    Or maybe @Torspd know?
    Sorry to keep bothering you man.
    You are the only one I know off the top of my head that has probably HAD to run a different FP.
     
  4. Dec 2, 2020 at 7:54 PM
    #4
    JL8Jeff

    JL8Jeff [OP] Well-Known Member

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    I'm looking to go supercharged so the stock 4 cyl pump probably won't be enough but the 6 cyl pump might be. It will depend on the amount of boost, injectors and hp level on what pump volume is needed. It would be nice if it was easy to look up some of this information but boring stock 4 cyl and 6 cyl stuff is left out of a lot of testing. The factory turbo cars have tests of injectors and fuel pumps all over the place because it's easy to exceed the stock pump with small mods so guys do a lot of flow testing so they don't blow up their motors. I'm mainly wondering if 5-7 lbs of boost will be ok with the v6 pump if it really does have more flow/volume than the 4 cyl pump and I can find a new one cheap enough. It's more of a research and data thing I guess. You can't find a good flow number for the 4 cyl fuel injectors either (I thinks someone said the FSM showed 265cc to 348cc flow) so it makes it tough to know what they can support.
     
  5. Dec 2, 2020 at 8:50 PM
    #5
    TnShooter

    TnShooter The TacomaWorld Stray

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    Torspd likes this.
  6. Dec 2, 2020 at 9:40 PM
    #6
    lynlan1819

    lynlan1819 Well-Known Member

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    Dont cheap out on the fuel pump if you are Supercharging your truck,get the proper pump.
     
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  7. Dec 3, 2020 at 5:21 AM
    #7
    Torspd

    Torspd Tor-nication

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    URD has fuel pump upgrade kits. Easiest to deal with, as it is all inclusive. Get a minimum of 255LPH, unless you plan on building your engine. Then call it a day.
     
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  8. Dec 3, 2020 at 5:24 AM
    #8
    Torspd

    Torspd Tor-nication

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    On the earlier 2nd gen 4.0 Tacomas, the fuel pumps were smaller than that of the same year model 4Runner, with a 4.0. It shared the same chassis with the V8, so they just installed one pump.

    Later model 4.0L Tacomas may have had a fuel pump size increase.

    It could be surmised then that the 2.7l came with even a slightly smaller pump.
     
  9. Dec 3, 2020 at 5:28 AM
    #9
    Torspd

    Torspd Tor-nication

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    Here is a fuel flow reference, for the 2.7L.

    Screenshot_20201203-072705_Edge.jpg
     
  10. Dec 3, 2020 at 7:50 AM
    #10
    JL8Jeff

    JL8Jeff [OP] Well-Known Member

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    They show the alternate part numbers which include both the 4.0 V6 pump and 2.7 4 cyl pump so that reference could be questionable. 26 gph comes out to around 98 lph which sounds like it would be right for the V6. If I can avoid cutting and splicing too much and upgrade the pump for less than the cost of the pump from URD, it would make for a cleaner install. I'm not looking for more than the 200-210 hp range so some of the pumps could be overkill. I'm not too concerned about the external filter since I've only put 50K miles on 1 vehicle in the last 35 years of driving, the Tacoma I've put 8k miles on in the last 32 months. I'm not looking at cheap fuel pumps, it would be a genuine Toyota (Denso) pump or one of the upgrades. So this is all good research to me and it might help others as well.

    Wow, I looked through all the fuel pump assemblies on Rock Auto just to see what they show for flow ratings and they go from 16 gph (60.56 lph) to 26 gph (98.42 lph) to 41 gph (155.2 lph) to 51 gph (193.05 lph) through the various brands. I assume that is so one assembly will work for multiple vehicles (like the Delphi unit pictured above).
     
    Last edited: Dec 5, 2020
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  11. Dec 3, 2020 at 8:56 AM
    #11
    Alexely999

    Alexely999 Well-Known Member

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    1.3L duh :anonymous:
     
  12. Dec 3, 2020 at 9:12 AM
    #12
    nd4spdbh

    nd4spdbh Well-Known Member

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    Spend the money for the URD upgrade. Do it right with some corrugated fuel tubing. You will get a better pump than stock replacements and an external fuel filter. All for ~ 200 bucks.
     
    badger, TnShooter and Torspd like this.
  13. Dec 4, 2020 at 8:16 PM
    #13
    badger

    badger Well-Known Member

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    I just put a urd upgrade in my truck and it seems to have restored some lost power over 176,000 miles The intake filter on the Walbro pump that I got is much larger than the stock one. Lots of advantages here. For one thing the pump can actually be replaced without replacing the whole bucket sender unit, and a spare Walbro is only about $85 dollars. I'm very pleased with this upgrade!
     

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