jdmtightyo

does anyone know which wire on the main relay is for the fuel pump/ and injectors.... i am wanting to bypass the main relay because it takes 10 mins for it to finally turn on the pump and all... i know there is a way to bypass it just not sure which wire it is and which spot you run it to on your fuse box under dash.... any help would be awesome thanks..

jdmtightyo

sorry its a 93 civic DX with the D15

aasarsak

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superbean

your kidding?

IF you bypass it, then it will always be on.

Just put a new relay in it.

jdmtightyo

i did put a new relay on it... and i have seen people bypass it straight to the fuse box to where it only comes on when the key is in on position... the new relay worked perfect for 3 days then started doin the same thing again...

Relic1

if by new you mean from honda, then pull the ECU, have someone who can work on circuit boards replace the large electrolytic cap close to the connectors. That should fix the delay'd fuel pump problem. This is a common problem with our ECUs since they are getting older.

If your "new" relay was from a yard then it's likely it has the same issue yours does... have it repaired via resoldering the connections in the relay. (do the ECU while you're at it)

Keep in mind this problem will only get worse with time, it will not prime at all sooner than you think.

bypassing the relay is not only dangerous it's going to cause a lot problems. The pump and injectors are not meant to be on all the time.
one last point, the injectors and fuel pump are different wires...

jdmtightyo

i found out that the pump and injectors were different wires... the resoldering the ecu idea is great i will be trying that and be getting another brand new main relay also this way the problem is all fixed at once... hopefully.... appreciate that idea...

civic_driver

if it's taking that long to turn on the pump, maybe your ECU is the problem and bypassing the relay won't fix your problem.

also, when you bypass the relay, you're running the risk of ruining the ECU as the pump will try to draw a high current from the ECU and might ruin it in the process. the relay runs from the small current that the ECU supplies to it and in turn the relay runs the pump with a high current.

the main relay is put there for a reason

jdmtightyo

i just went and got a new main relay and am getting new ecu later this week..

civic_driver

I didn't see Relic's post earlier. Instead of buying a new ECU you can follow his advice about replacing the capacitor on the ECU which should fix the problem according to him.

jdmtightyo

i went ahead and just got new main relay and new ecu... the problem is fixed it was obviously the ecu... cause i put relay on tried it... still the same thing... replaced the ecu fixed it right up... thanks for yalls help...