General Calling all Guru's help needed!! Fuel Relay issue B Swap Engine

Discussion in 'General Discussion' started by nick-b, Sunday 15th Mar, 2015.

  1. nick-b Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Nick oxford
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    Hi all,

    I have been transferring a complete B18C4 engine and LSD box into my EK3 and seem to have hit a small snag.

    The engine is installed and works fine except for the fact that the fuel pump won't activate without a constant feed from a battery lol

    OK let me try to explain, I have a P28 ECU from the donor car....

    8CE7F8F2-6D72-4D8E-92C0-976DB434DF33_zpshm00hasa.

    This works fine, however what we can gather is that the fuel pump relay isn't connecting properly to the ECU so therefor not telling it to prime the pump and feed the engine.

    130D0EB3-6D59-460E-AB8A-A7B4AC3C65C4_zpsfa0swi3c.

    This is the lead that goes from my cars wiring loom to the ECU, my original connector has all the right wires but it seems that the engines loom is missing the required wires to connect it to the ECU?

    EDC10FCD-1AFB-4F2B-8F72-790870062E6C_zpsz2t4hyea.

    I have an OBD1 ECU with a wire harness, notice only 2 plugs connected, this is also a worry as the engine ran in the donor car and this is the same harness?

    D01B1FA2-7968-44E3-A2AB-5E81EF97E0FE_zpsz19ttftj.

    8A5DDBA7-0D95-4365-8EA2-4A386260D128_zps0rdx8yaz.

    Now if i supply the fuel pump with constant power from the battery it runs fine (apart from no rev counter) however we don't want to run it this way in case we come across problems..... So has anyone fitted a B18C4 to a Civic EK3 and experienced any of these issues??

    Any help would be gratefully appreciated as I am totally stumped lol.

    Thanks all.
     
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  2. Nighthawk Guest

    United Kingdom Richard Milton Keynes
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  3. nick-b Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Nick oxford
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    I reckon it is a simple case of running a few wires from ECU to fuel pump relay, and possibly a feed for the rev counter? However always better to seek proper guidance before i blow the engine up lol
     
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  4. SpeedyGee Administrator Staff Team

    England Speedy Birmingham
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    I'm not up to speed with the B swaps.

    But from what I gather you shouldn't have to do any special wiring for the fuel relay or fuel pump for those to work. This should be taken car of by the loom.
    So this kind of suggests that there is issue on the loom.

    As a work around you should be able to connect the switched live from the main engine relay to the fuel pump. This should switch on the pump when ignition is switched on.
     
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  5. SpeedyGee Administrator Staff Team

    England Speedy Birmingham
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    Which loom are you using ?
     
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  6. RogerH69 Premium Member Club Supporter

    South Africa Roger Oxford, UK
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    I seem to remember Nick and his mate suggesting this as a workaround, but they were concerned about the pump not being switched off in the event of any issues (fuel pressure was mentioned).
     
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  7. SpeedyGee Administrator Staff Team

    England Speedy Birmingham
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    There's no fuel pressure monitoring/sensors on the B series engines so that wouldn't be an issue.
    - - - Updated - - -
    Ok, let's have a rethink ... found a pinout of the P28 ECU Swapping your manifold bladiebla

    FLR1 - Pin 7 on the ECU seems to be the one for the fuel relay, so they could test this and run a wire from there to the fuel relay.
     
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    exec and RogerH69 like this.
  8. RogerH69 Premium Member Club Supporter

    South Africa Roger Oxford, UK
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    Now that's why we ask these questions on forums :Smile:
     
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  9. nick-b Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Nick oxford
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    we were looking at the pin out from ECU and pin in from the green plug to bridge the connections and run the fuelk pump, however we didn't want to blow up the ECU lol
     
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  10. SpeedyGee Administrator Staff Team

    England Speedy Birmingham
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    You are going through the fuel relay (ie not running the pump direct from ECU), so that shouldn't be an issue.
     
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  11. nick-b Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Nick oxford
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    hmmmm might have to see if we can run the ECU to green plug and get the fuel pump relay to activate the fuel pump.

    Does the rev counter work from the ECU as well??
     
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  12. SpeedyGee Administrator Staff Team

    England Speedy Birmingham
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    I'd imagine that comes straight from the distributor RPM signal wire.
     
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  13. nick-b Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Nick oxford
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    I keep getting people telling me I have the wrong loom, and that i should get an EK4 loom?

    However this is the loom from the donor car and it ran just fine in that?
     
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  14. nick-b Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Nick oxford
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    when the weather sorts itself out i might take a look lol
     
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  15. exec Premium Member Club Supporter

    United Kingdom London
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    Did you ever get this sorted?
     
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  16. nick-b Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Nick oxford
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    Replaced the wiring loom, and have most of the issues sorted now, however still keep getting an engine management light........ I will check that when i get time. Was an error code for the O2 sensor, however just recently replaced that so will check the codes again and see if that has changed.
     
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    BB Baboonface and exec like this.