bigdaddyp

Ok, here is the story, Saturday my brother bought an 84 RX7 GS for $100. Well, we got it home, threw in some fresh spark plugs, and with a little working and tweeking we were able to get it running within a couple of hours. Ok, so today we go to crank it, and it wont will turn over and everything, and if we spray starting fluid in it, it will run for a few seconds and cut off. My brother said, when inside of it, he cant hear the pump runing. Is it mabey the pump isnt working, or mabey the fuel filter? Please help us we are new to this whole thing. Thanks in advance.

Zyrano

switch out the fuel filter first, they tend to cause problems, see if that helps. Then check for spark and fuel, the fuel pump tends to be very quiet so you might not hear it very well (it's more of a low level ticking)


Alvin

skrewloose78

remove the fuel line from the carb, turn on the key and see if fuel comes out. IIRC the fuel pump should run as long as the switch is on. if you dont have fuel there see if the filter is clogged and then check your pump.

kllntyme

I had a wiring issue with my 85's fuel pump. One day it was fine, the next no go juice. I ran some new wiring through a relay and all was right with the world.
Check the wiring connection (under the driver's side storage bin) with an ohm meter before ordering a new pump. I once had an FC, so I always assume the wiring is faulty or that I have a really bad ground.

By the way, Zyrano is right, the pump is very quiet. Turn the key, get out of the car and put your hand on it. If it's vibrating and you are still getting no fuel then bite the bullet and order a new one.

Kentetsu

Hm, I think on some models you must be actually cranking the engine to get the pump to run. If I remember correctly from when I tested mine.

Myc1972

Yeah, it should be very easy to check if it is your fuel pump.
Like he said disconnect the fuel supply hose to the carb (fatter hose) and use something to
catch the fuel, preferably something that can measure how much fuel is coming
out in U.S. Quarts.

Turn the key for one minute, to the point before cranking. (when the
dash lights come on)

Turn the key to off.

If nothing comes out try cranking it, just in case it requiers it.


On mine it should be arround 1.6 U.S. quarts that came out in a minute.
I am not sure about yours but it might be around the same, if someone knows
please correct me.

But if fuel comes out at least you know the pump is working.
Changing your fuel filter is a good idea in any case.

Let us know your results.


PS: Kentetsu, you were right about my problem being electrical, i had a loose
pump connector. Thanks!

aussiesmg

iTrader: (1)

How old is the fuel in it? Did you empty the old gas? If not you probably clogged your filter and it will do it again if you dont get rid of the bad fuel. If it sat for a long time drain the fuel, my 84 and 85 both have drain plugs in the fuel tank, after its emptied, add some fuel. Then pump that fuel through to the disconnected fuel line in the engine bay until it goes clear again. At that time change the filter so so forth. Your plugs will be fouled if this is the case also.

I had to go through all this with mine and it rans great after I did this. Add a little Marvel Mystery Oil to your gas and to your oil, the stuff is amazing.

TurboIIGuy

Yeah same here.
Oh the last 5 RX7's I've owned in the past couple of years all of the pumps stopped working one day to to no power for some reason.
I just run a wire from the fuse panel under the dash to the pump and then ground it to a screw.
Also if it was sitting for a long time the fuel could be bad....It turns into varnish after a long sit with bad burning characteristics.
Just unplug the fuel line fromthe carb and see if it shoots fuel out. All you need to do is turn the key forward not crank it. If there is no fuel try giving the pump direct power, it's under the driver side cargo bin. This stuff is easier than having to get under the car IMO.
If all else fails then you can pust out the jack and get under there to check the pump and filter.
Good luck..

Myc1972

[QUOTE=Myc1972]
On mine it should be arround 1.6 U.S. quarts that came out in a minute.
I am not sure about yours but it might be around the same, if someone knows
please correct me.[QUOTE]


I ment 1.16 U.S. quarts!!!

Sorry

damdav

I had a problem with my 85. It had been sitting up for a little over a year. Fuel was not reaching my carburetor. I could get it to run by putting a little fuel into the carburetor, but it would quickly die. The fuel pump was running, but it would not pull any gas from the tank. I tried blowing out the fuel lines, but it still would not work. I finally pulled the gas tank off, and found out that there was a filter inside the tank, and that the lines going into the tank were clogged with a varnish like substance. I blew the lines out, and it ran perfectly.

Tech_Greek

Damn my dad finally posts...after being registered forever!

skrewloose78

i know on the gsl-se it has to be cranking or you can hold the flapper on the AFM open. im not surew about the 84-85 12a cars but i know on the 83 and older it runs as long as the key is on

Whanrow

Anbody consider carbon buildup? If it sat a long while, then they got it going some carbon may have come loose and is sticking apex seals.

Not carbon lock as it turns over, but carbon buildup reducing compression.

Here's a bible for trouble shooting cars that won't start:
https://www.rx7club.com/showthread.p...ht=carbon+lock

Here's another good thread on carbon in a rotary:
https://www.rx7club.com/showthread.p...hreadid=281207

Here's some more:
https://www.rx7club.com/showthread.p...postid=2385473

Kentetsu: I think you're right about fuel only as you crank, but I'm pretty sure that is only gsl-se. I've never had a problem with fuel on mine (touch wood), so I can't be positive.

bigdaddyp

Thanks ALOT for all the help guys. We are going to do some trouble shooting using your guy's ideas on saturday.

$100T2

iTrader: (1)

Make sure you're running the right spark plugs, too. If you have anything other than NGK spark plugs, you're running the wrong ones.

Kentetsu

I can confirm that on my '85 GS, you do have to be cranking before the pump will run. Hope this helps some...

Kentetsu

Also, won't the pump refuse to run if the trailing ignitor is blown? Might want to check for spark on your trailing just in case.