RX7 allnight

ok so the fuel sending unit went out in my 88 N/A vert. fuel pump still works fine. (only reads half full and up)

i have a TII lying around so i took out the fuel pump unit and switched sending units onto my vert.

atfer i switched the fuel sending unit i decided to check the connections with a meter..

when i tested the TII unit everything seemed fine.
but when i checked my vert unit there seemed to be a problem

when i took my multi meter and put one end on the + connector i put the other on the fuel pump + and it made the beep telling me theres a good connection.. but when i put it on the - side it still made the same beep as if the + and - were toucing somehow.. i dubble checked the TII unit and it only beeps when i touch the + side with the + wrie on the connector

whats up with this? sorry kinda hard to explain

RX7 allnight

i was testing from the plastic connector to the + and - of the fuel pump

RX7 allnight

so internally the fuel pump has a bad/open ground?

eage8

iTrader: (9)

yeah, sounds like there is a short.

why don't you just swap the whole assembly from the TII?

RX7 allnight

isnt the fuel pump for the tII different?

could there be a problem with having a fuel pump with a bad ground?

RotaryRocket88

iTrader: (7)

The TII pump flows more than the NA pump, so putting it in would result in even richer AFRs. Something you don't need.

I read over your multimeter test description a few times, and it sounds like you just proved that there is continuity between the + & - terminals on the fuel pump. If there wasn't continuity between them, the pump wouldn't run. There is no internal switch on the pump that turns it on and off; that is all controlled by relays in the car.

RX7 allnight

^ exactly what i was saying theres continuity between the + and - terms on the pump.

i tested this method on the TII's fuel pump and got nothing. so does this mean the TII's fuel pump has gone bad?

RotaryRocket88

iTrader: (7)

I guess so. Take a battery and connect up the TII pump for a second. If it spins, it still works. If not, you'll confirm the continuity test result.

RX7 allnight

the tII had been sitting for 6 years. i fluished everything and it did start and run.. horribly but it did run it didnt hole an idle or anything but it did fire up iall check and see, thanks for your help