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LS-V Swapped Ek fuel pump/Main relay issue

 
Old 03-13-2019, 10:47 AM
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Default LS-V Swapped Ek fuel pump/Main relay issue

Hello I am in the process of finishing my project car and Iíve ran into some issues after it being assembled. When I try to start it the fuel pump doesnít prime unless I jump the wires shown in the pictures. And when I do jump them the car still doesnít want to start, brand new dizzy, main relay, P06 ECU from Xencron and rywire obd1 harness. Any help is greatly appreciated.


4th wire on top of A ECU connector (fuel pump)
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Old 03-13-2019, 11:30 AM
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Default Re: LS-V Swapped Ek fuel pump/Main relay issue

I have the same exact issue. I have a background in low-voltage so I checked if thereís any breaks in the lines and there were none which means bad ground. When I jump the pump turns on just no dice when I donít jump. You have a bad ground. I replaced the main relay, made sure voltage was at each location before finding out that the main relay is grounded inside the ECU unit. Itís only five screws to open it up and four bolts to take it out. Opened mine last week and sure enough The ground fuses for the main relay were blown inside the ECU. You can either re-solder or get another one from the junkyard. Also just to add Iíve heard it can be a loose fuse inside the main relay. You can use a flat head to open it up gently and re-solder whatever you see blown.
Eric the car guy on YouTube will show you how to fix the main relay.

I found out about the ground problem of the main relay in these forums. I will try to look for the forum that has the exact number of the fuses so when you open up your ECU you can identify which are the ground fuses for your main relay. Youíll save yourself a bunch of money finding out if the ECU has a bad ground. I just spent a bunch replacing everything and all I had to do was pull out an ECU from the junkyard to fix.
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Old 03-13-2019, 11:45 AM
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Default Re: LS-V Swapped Ek fuel pump/Main relay issue

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Old 03-13-2019, 12:20 PM
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Default Re: LS-V Swapped Ek fuel pump/Main relay issue

I just bought this brand new ecu less than 2 weeks ago from xencron, they apparently test them before shipping it out and when I opened it up to put my base chip in the socket, the circuit board looked prestine. Iíve tried multiple relays as well, weíre almost thinking one of the wires needs to be repinned but weíve never ran into this problem working on it before.
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Old 03-14-2019, 02:45 AM
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Default Re: LS-V Swapped Ek fuel pump/Main relay issue

Check thermostat ground?
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Old 03-14-2019, 09:33 AM
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Default Re: LS-V Swapped Ek fuel pump/Main relay issue

Yes, I had the thermostat housing powder coated but we sanded it back down to the metal and has continuity
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Old 03-14-2019, 08:51 PM
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Default Re: LS-V Swapped Ek fuel pump/Main relay issue

Originally Posted by codysf30 View Post
Yes, I had the thermostat housing powder coated but we sanded it back down to the metal and has continuity
What about the two surfaces of the thermostat housing that make contact with the block to maintain the continuity throughout the block and ultimately through to the frame rails ???
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Old 03-15-2019, 06:31 AM
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Default Re: LS-V Swapped Ek fuel pump/Main relay issue

Originally Posted by JRCivic1 View Post
What about the two surfaces of the thermostat housing that make contact with the block to maintain the continuity throughout the block and ultimately through to the frame rails ???
thatís an amazing question. Iíll check right on that thank you.
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Old 03-15-2019, 08:09 AM
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Default Re: LS-V Swapped Ek fuel pump/Main relay issue

i'm, not sure why anyone would powder coat a piece that will never be seen by anybody unless it gets pointed out
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Old 03-15-2019, 09:47 AM
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Default Re: LS-V Swapped Ek fuel pump/Main relay issue

Originally Posted by tony_2018 View Post
i'm, not sure why anyone would powder coat a piece that will never be seen by anybody unless it gets pointed out
itís a shave and tuck build, very visible.
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