Alright guys, despite hours of searching I have yet to find any thread that covers my situation so I had to start this one. I'm not sure this is a beginner level problem but I have to post it here so here goes. I apologize ahead of time for the length.
The car is a 1990 EX coupe with an Accord Euro Swap controlled by a P28 with an S300 chip. The car initially had a P72 running the same chip/tune. The car was professionally tuned (not dyno'd unfortunately) and ran flawlessly as far as the engine was concerned.
One day in January of 2016 I went to start the car and nothing, no clicks, no priming sound. It had battery power as all of the lights and radio would work perfectly. I consulted my Helms manual and after checking all fuses checked the main relay. I thought I heard it clicking when powered up so I assumed the pump had gone bad which wouldn't be out of the question since the car had 240K miles on it.
Fast forward a bit and I finally received the correct Walbro pump kit,I decided to go with this because I have plans in the future which will require more fuel anyways so I figured to kill two birds with one stone. I also replaced the fuel tank as it was gunked up and this was suggested by some knowledgeable friends. So fuel pump wired up and installed in the tank and the tank installed and filled with fuel I attempted to start the car. Still not priming so obviously still not starting. I had at this point a fresh battery because the old one had gone dead.
I checked all fuses and re-checked the main relay and decided maybe it was the culprit. I pulled it, smelled it to see if it smelled burnt and couldn't really smell anything like that so I opened it up and didn't see any damage. As an added measure I purchased a new OEM main relay ( the one installed was some Chinese junk). New relay installed, same issue, no priming of the pump.
I pulled the pump and after letting it dry completely I checked it with 12 volts direct using a short temporary harness and it was good to go. I also checked the factory pump and it also was operating.
So at that point I know the fuel pumps are good so it's a matter of power not getting to them, which means either a break in the harness that goes to the trunk (possible but not likely since I had done nothing that would have caused that and the car had run literally the day before it went dead). It could be a fuse or relay but all of the fuses in both boxes checked out and a bad Honda relay from my experience isn't very common. So I checked the ECU and sure enough there is a small burnt spot on the ECU. So I ordered a new ECU (hondata socketed P28) install it and give it another try. I am sure I heard priming initially but the car would not crank over. The next day it did not appear to prime (maybe I just didn't hear it) but there was a clicking sound from under the dash (I'm thinking relay). The battery was getting low with all the cranking attempts so I had it charged.
On a side note I also tried wiring the pump opposite to how it was wired initially thinking maybe I had wired it wrong and it wasn't able to prime or was priming in the wrong direction. This didn't make any difference and I have re-wired it back to the initial way it was wired which is how all the picture show the wiring done.
Currently with a freshly charged battery the car will not prime however I have found that the under dash ECU fuse is blowing. I have checked the ecu and it is all fine and well.
So I am now asking for help as the symptoms are not helping me track down the problem. I think it possible that something is grounding out but as far as other causes I can't think of any. Any help would be appreciated.
The car is a 1990 EX coupe with an Accord Euro Swap controlled by a P28 with an S300 chip. The car initially had a P72 running the same chip/tune. The car was professionally tuned (not dyno'd unfortunately) and ran flawlessly as far as the engine was concerned.
One day in January of 2016 I went to start the car and nothing, no clicks, no priming sound. It had battery power as all of the lights and radio would work perfectly. I consulted my Helms manual and after checking all fuses checked the main relay. I thought I heard it clicking when powered up so I assumed the pump had gone bad which wouldn't be out of the question since the car had 240K miles on it.
Fast forward a bit and I finally received the correct Walbro pump kit,I decided to go with this because I have plans in the future which will require more fuel anyways so I figured to kill two birds with one stone. I also replaced the fuel tank as it was gunked up and this was suggested by some knowledgeable friends. So fuel pump wired up and installed in the tank and the tank installed and filled with fuel I attempted to start the car. Still not priming so obviously still not starting. I had at this point a fresh battery because the old one had gone dead.
I checked all fuses and re-checked the main relay and decided maybe it was the culprit. I pulled it, smelled it to see if it smelled burnt and couldn't really smell anything like that so I opened it up and didn't see any damage. As an added measure I purchased a new OEM main relay ( the one installed was some Chinese junk). New relay installed, same issue, no priming of the pump.
I pulled the pump and after letting it dry completely I checked it with 12 volts direct using a short temporary harness and it was good to go. I also checked the factory pump and it also was operating.
So at that point I know the fuel pumps are good so it's a matter of power not getting to them, which means either a break in the harness that goes to the trunk (possible but not likely since I had done nothing that would have caused that and the car had run literally the day before it went dead). It could be a fuse or relay but all of the fuses in both boxes checked out and a bad Honda relay from my experience isn't very common. So I checked the ECU and sure enough there is a small burnt spot on the ECU. So I ordered a new ECU (hondata socketed P28) install it and give it another try. I am sure I heard priming initially but the car would not crank over. The next day it did not appear to prime (maybe I just didn't hear it) but there was a clicking sound from under the dash (I'm thinking relay). The battery was getting low with all the cranking attempts so I had it charged.
On a side note I also tried wiring the pump opposite to how it was wired initially thinking maybe I had wired it wrong and it wasn't able to prime or was priming in the wrong direction. This didn't make any difference and I have re-wired it back to the initial way it was wired which is how all the picture show the wiring done.
Currently with a freshly charged battery the car will not prime however I have found that the under dash ECU fuse is blowing. I have checked the ecu and it is all fine and well.
So I am now asking for help as the symptoms are not helping me track down the problem. I think it possible that something is grounding out but as far as other causes I can't think of any. Any help would be appreciated.
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