View Full Version : No power to fuel pump (what to diagnose?)
eg mike
06-01-2009, 02:02 PM
I installed a full main harness in my car Saturday and after done, no power to the fuel pump.
I tried 3 different main relays and still no luck.
I checked Fuse 18 and its good.
Anyone know what I should check for next?
Barefoot
06-01-2009, 03:27 PM
do u have power going into the main relay
eg mike
06-01-2009, 04:20 PM
do u have power going into the main relay
Yes I got a constant hot on the white wire I believe with test light.
Tech5
06-01-2009, 04:31 PM
so your test light works?
Are you trying KNOWN working Main Relays???
Is your ignition switch working ? not the lock cylinder the electrical part?
all your plugs firmly installed correctly and was this a used or new harness? if used did you check for cut wires,burnt,cracked,wires?
Have you tried hitting your dash with your fist lol
Barefoot
06-01-2009, 04:58 PM
Yes I got a constant hot on the white wire I believe with test light.there has to be a fault in the new harness someplace. if u have power going out but nothing at the other end.
B18c1Turboed
06-01-2009, 05:40 PM
Put the pump on a seperate relay then ,use a 12v soure and toggle to trigger the main relay on.
Damn, Mike. I'm having the same problem... shit's gay
Check your thermostat ground - according to the schematic, that's where the relay gets its ground.
-jonathan
Z0_o6
06-01-2009, 06:50 PM
Check your thermostat ground - according to the schematic, that's where the relay gets its ground.
-jonathan
bingo. 90% of the time after swapping a harness, people miss a small ground somewhere.
preferredduck
06-01-2009, 09:48 PM
bingo. 90% of the time after swapping a harness, people miss a small ground somewhere.
these are there for a reason' i hate electrical troubleshooting but the first thing i check is it grounded.
Motivation
06-01-2009, 09:57 PM
he figured out the problem... Was the relay... The three he tested were all bad.
he figured out the problem... Was the relay... The three he tested were all bad.
Lol - sad... Almost typical of a Honda relay. :goodjob:
-Jonathan
eg mike
06-02-2009, 08:42 AM
he figured out the problem... Was the relay... The three he tested were all bad.
Yeah, I tested them on Sunday when it was like 85 degrees outside..... I re-tested last night after going through the schematic and was about to give up and tried the main relays again. Got 1 to work!
I should of known the heat would of got to the relays! The solder on them crack from heat and its screws the connection up!
Well coupe is running smooth, and I am excited to finish putting it back together!
Thanks for all the comments guys!
Purp try some other main relays :P
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