Hello evbery body i was driving my 82 280zxt 2+2 around in heavy rain and then my car stalled and died... i didint get any water into the air intake or anything the pump pump shut off and came on once or twice... then came back on.. now hears the problem i got the car home and when i turn the key the fuel pump donest come on , but i hooked up a hot wire from the car battery to the fuel pump the pump comes on.. and when i tuern the key the car starts.. but when i take off the hot wire the car dies... what do yall think it might be ? if its a relay or box can yall tell me were to find it ? thanks , KEN

 

the fuel pump relay is under the passenger side of the dashboard. Remove the glove box and you've got free access to it. The fuel pump modulator is located under the drivers side of the dash. Just remove the lower dash panel and the side kickpanel and its right there. The relay provides power to the pump. The modulator regulates how much power goes to the pump. If either one takes a crap or stops getting power then fuel pump no workie

 

question about the boxes under the passenger seat i wasnt feeling well and i left the passenger window rolled down in my 82 turib and we had massive ammounts of rain and when i came out in the morning time.. i found my passenger seat about 3 inches of standing water so after i cleaned up all the water with towels.. and a hair dryer... i tried to turn the car on.. but nothing still... could it of friend the fuel pump relay ?

 

none of that stuff has anything to do with the fuel pump. However, if you shorted a circuit there it could have taken out a fuse link or fuse that the fuel pump, or one of its circuits relies on.

 

would it be safe to hot wire the fuel pump to a off and on switch ? until i am able to fully find and fix the problem .. ?

 

I have mine wired so that the ignition switch directly controls my newly rewired relay. I just ran a power source to the relay via the fuse box, and then on to the fuel pump. I then wired the ignition switch to control the power to the relay. I also wired in a kill switch cause listening to that fuel pump humming when the car is not running can get annoying.

you can power the pump directly via a switch, just make sure you run a fuse inline.

 

ok i went down to walmart bought me a nice red toggle switch that lights up when its on.. so what size fuse do i use ? j fairlady z.. do u think a 20 amp fuse will be ok ?

 

If you are going to rewire your fuel pump, DO NOT just run a wire from the battery to the fuel pump!

Do as J has done & wire up a relay to control it.

 

20amps is fine.

As long as the toggle switch can handle it then a relay really isnt necessary. Just dont run anything else off of that switch. But use a heavy duty toggle switch so you dont burn it out. Thats the really on the only reason relays are used: To protect protect switch's. (in some cases its to reduce the amount of heavy gauge wiring necessary) Once the relay is switched on all you have, basically, is a wire running from the battery to the fuel pump. As long as its fused then a battery to switch to fuse to pump circuit is not going to hurt anything.

But using a relay is far preferable for longevity purposes. I just found it more convenient to have use a relay and have the ignition switch act as my on/off.

 

LOL this is all of my next Q... was goin to ask the same thing WOW

very nice knowin I am not the only one out there with the same prob
\
later

 

What about that 2 speed fuel pump controller that sits behind the ecu?

 

If the rain was really heavy and there was a lot of standing water, check the distributor cap for moisture and dry out the electrical connectors to the injectors. It could be just excess moisture disrupting the connections.

 

Ok well its been some time now the large wires used with the on / off switch has worked very well... , but latly i have noticed a winding sound coming from the fuel pump as idel ? but goes away after about 2,500 rpm ... fuel pump going out ? i havent had a good day off in a week or 2... im gonna change out the relay on my next day off and tell yall if it works...