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Kash$EF

Fuel Delivery Issue

Hi all, I recently purchased a 1990 LX sedan. It didn't start which is why i got it pretty cheap but anyways, first thing i checked was to see if it was a fuel issue. I opened up the line at the filter to see if the pump was pushing anything out, and it was not. I put the key into the "on" position and the pump wasn't even priming, so I naturally suspected the fuel pump. I checked the voltage at the fuel regulator (connector under rear seats) and I got a steady 6.1 volts which I believe is within spec. So I pulled the gas tank to see if the pump was shot. I took it out and provided it with a 12v and it came right on. So it isn't the pump that is the issue. I put everything back together and I checked the voltage at the connector, and again I still have 6 volts. Now when i connect the male connector to the female connector the voltage drops to 0 for some odd reason. Now obviously the pump wont come on with 0 volts but i dont understand how the voltage jumps from 6 down to zero as soon as i connect the wires. Please help!   Surprised
4dred6

Short in the gas tank harness? Try to start it by giving the pump 12v directly.  Try to use a fuse tho.
Kash$EF

Ok, so i figured out that the main power wire, (black and yellow wire) had a few ohms of resistance and was consuming 3 volts, and the pump needs approx. 9 to kick on. So I made a jumper wire around the high resistance yellow black power wire and the pump came right on. So I redid some wiring and put everything back together... and guess what it stopped again with a different problem. Now the main relay (which has been tested and passed) isn't staying closed for the pump to receive power. Its supposed to stay closed for like 3 seconds when the key is in position 2. it closes and immediately opens in a split second, and when i try to turn the motor over, the relay clicks repeatedly. Some had said it may be a ground issue? if so where are the major grounds? thank youu
4dred6

Battery to chassis
Chassis to tranny
Chassis to vc or head
Ground on the thermostat housing

Ground for the fuel pump. Mine is 88
And it was grounded under the seat.

Maybe under the dashboard
Kash$EF

Thanks bro i appreciate the input, im gonna check these grounds as soon as i get home. I spoke to one of my fellow technicians and he said its highly likely the main/pgm-fi relay thats the issue. I tested it and it passed all tests but i guess it may be some type of internal issue so im gonna be buying one very soon. Ill let you know if this fixes the problem. thank you
4dred6

no problem  Wink
89 LX SOHC ZC

Check this out it may help.
http://efcivicsedan.myfreeforum.org/about3345.html
Kash$EF

89 LX SOHC ZC wrote:
Check this out it may help.
http://efcivicsedan.myfreeforum.org/about3345.html


^^ thank you, im gonna try to re solder these points, i got a chance too look at the internals of the relay yesterday but i didnt notice any outstanding cracks, im gonna check again today and see if i can re solder them.
89 LX SOHC ZC

I had a lot of trouble with relays until I did this and knock on wood its been months since ive had an issue. God luck with this issue.

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