So heres the story....

I just picked up a 91 civic Si. Pretty much all original, just has a system and rebuilt motor.

I got it not running, seller told me it had a bad fuel pump.... So after i picked it up i swapped the pumps..

Still the pump doesnt turn on.. So, i change the main relay. Nada.. Ecu is good, i think.(it primed my other 90 Si).... (all other electrical works great, car cranks fine.) Fuses look good.

The wiring has never been fooled with...
So now pull out the volt meter and check those fuel pump wires. It shows 2.xx which doesn't seem correct.
I put the volt meter to the roof light and it shows 12.xx volts.

I called the guy to asked what exactly happened to the car..., he says that he was making a right turn, and the car just suddenly died out..


Now does anybody have any ideas????

 

check the ground wire connection to the thermostat housing to make sure that it is clean and secure - this is the ground for the main relay, ECU, shielding and some of the sensors - also check fuse #37 in underhood fuse box - it is second one up from bottom on right hand side and is fuse for main relay

 

Thank you for the imput.

So i checked that ground and cleaned it also the fuse.

Still nothing. =(

 

I ran a power from the battery straight to the fuel pump. It works..

So i cranked the motor, but it still doesnt wanna start...

Tank has gas, so idk.

Please help!!

 

Check the power off the main relay:

 

Can you elaborate a little?

What am i looking for exactly?

I already put the main relay on my other car and it works...


thanks..

 

check the wire (7) on the output from the relay and see if its getting 12v power. if it doesn't to keep tracing it.

 

will do...

Thanks..

 

Ok so i checked the output going into the relay.. And its not getting power..

So rechecked the grounds and everything else.. I still dont know!!

Heres a list of things i checked/replaced:

-Replaced fuel pump.
-Replaced main relay.
-Checked all fuses..
-Checked grounds.
-tried another ecu..
-Replaced ignition..
-Replaced under hood fuse box..

All this and still the fuel pump will not turn on!!

This wiring on this car is 100% original.. No alarm or fuel cut off switch..



Also when i turn the key to acces the cel comes on and stays on. the battery light DOES NOT come on, but the motor will turn over,the radio still comes o. Fuel pump is not priming.....



Has anybody had this problem b4???

Or any input on this!!!

Please help me!!

Ijust wanna drive my new car already!!

 

Codes?

 

i had this same problem not to long ago. Mine turned out to be fuse number 14 under the dash.

Hope this will help a little.
https://honda-tech.com/forums/showth...2#post46544822

 

WOW THAT'S WHAT IT WAS!!!!

So now the fuel pump goes on...

New problem... It wont turn over..

It has been sitting for about 3 months..

It has fuel in the tank..

Any ideas?

I was gonna change the spark plugs, oil, and fuel filter..

 

What do you mean by it wont turn over?

Is the car cranking, have spark?

more details ...

 

It cranks, and has fuel, but wont start..

Checking spark right now..

 

Did you get it to start or find out there is no spark?

 

Not yet..

Whats the best way to check 4 spark?

lol..

 

im having the same problems in the same car. no power to pump but it works when given 12V from batteries. been trying to electrically diagnose it but no luck.

 

Check fuse number 14 under the dash.

Thats what it was for me and others..

 

ED7 whats going on now. Fuel pump is priming all in dash lights and hazards work properly?

car is just cranking and cranking but will not fire up?

 

Fixed it..

It was also the rotor, coil, and cap!!!

Thank you sir..