ackershaw

I have never owned an RX-7 before and the car I am speaking of is currently my friends but I am hoping to buy it off him to use as a weekend car. Anyways, with the description of my purpose for this car set aside, I am no amatuer nor professional when it comes to cars, so I am able to learn and understand.

CAR==> 1985 RX-7 GS 12A aka... The "TURD" as we call it

Ok here is the situation:
- it has been sitting for about a year, not too sure
- put some MMO in the carb to just to be careful of the engine
- turned the car over, no fire
- changed fuel pump
- checked the plugs, engine was flooded
- pulled the plugs, turned the engine over cleaned it out
- did a DLIDFIS ignition system
- checked spark again, still spark
- got a can of starting fluid, engine fired up
- would not run on its own, had to keep spraying to keep enigne going

1st Problem:
So from this point I figured it is the fuel delivery system somwhere. Now here inlies my problem, I dunno what to do, so I will tell you what I have done:
- checked new fuel pump, it kicks on with the ignition on, but it doesnt pump any gas
- checked the wires with volt meter ==> reads: .3 volts or something just with the ignition on and barely turning it over
- custom made some wires just to test the new pump, with 12 volts it really pumps some gas
- tried to start engine with the 12 volt wires and it just pumps too much gas I think
- turned engine on with both new pump, and old pump, and pulled off the fuel lines at the carb, and no gas was pumping through even with turning over several times
++So I am lost at what to do. I dunno how much voltage is supposed to be at the starter with just the ignition on. And, I dunno, if the wires are just bad, or if the fuse is bad. I haven't trying fully filling up the gas tank to see if it just needs the pressure of gas to help feed it to the carb.

2nd Problem:
- when we actually had the engine running on just starter fluid for like 5-10 minutes, some lines came off from large canister on the passenger side of the car mounted near the strut
++What is it and should there be fluid bubbling out of the larger hose?

12a79

have u tried changing the fuel filter might be dirty

hanman

With the key on you should have around 12V to the pump. If not backtrack the wiring to find the problem.
Is it a stock Mazda pump or an aftermarket? If it is an aftermarket, did you get a regulator?
I think the canister you are talking about is the charcoal canister, and there should not be any fluid coming out of it.

Check to see if you have fuel at the carb by checking the two windows in the float bowls, front and back. They should be halfway up the glass.

grease

The 85 has a fuel pump relay that prevents the fuel pump from pumping gas unless the engine is running. Use your 12 v direct wire rig to bypass it, use the original pump if it works, put on a new fuel filter, and about 3 gallons of gas in the tank and try to start it. Sounds like your new pump may be an EFI pump which puts out too much pressure. You'll need to add a pressure regulator to use it. The cannister is the charcoal cannister for the emissions system, and it should not have liquid coming out of it.

ackershaw

Ok, well, i have both the stock pump and a aftermarket.
- With the ignition on, you can feel some power kick in the pump, but then no fuel comes through, with the regular wires plugged in, it is like a surge of power but then no pumping.
- It isn't the fuel filter because with 12 volts the aftermarket pump pumps some gas
- I haven't checked the factory pump, but it did pump air just sparking it from the battery

I have figured it is probably not the pumps, and not the fuel lines. Here are the things I am guessing where the problem might be but I don't know how to check them.
- The carb, but with 12 volts fuel gets to it and inside (I believe)
- The electrical system [fuel pump relay, fuel pump cut relay, fuel pump resistor, the wiring, fuses, or control unit] but I don't know where the parts are and how to make sure they are working correctly

As for the canister, some kind of liquid was bubbling but it didn't happen till we had the engine running. So I don't know how to get the liquid out, or if it will end up being ok. If I had the fuel pump running 12 volts constant when trying to start it, could that have pressurized the system and flowed stuff into the canister?

grease

Check the hoses to the cannister. It should not be hooked directly to fuel lines. I guess it's possible that the fuel pump could pressurize the tank and force fuel through the vent lines into the cannister, in which case you could have some kind of major blockage in the fuel lines/system. Get yourself a FSM or Hayes manual and verify the connections to the charcoal cannister. I also suggest thet you disconnect the fuel feed and return lines under the hood and at the tank and blow some compressed air through them to be sure they are clear. Reconnect and try starting it again.

brownmound

Ackershaw, are you from League City Texas? I'm originally from Clear Lake. I've got a brown first gen as well. Check out the website.

Right on.

ackershaw

Ok, I did more tinkering today.
- Checked the wires and fixed my Tach and attached the condensor cable up.
- Fuel is moving now, I checked both the factory pump and aftermarket, both are able to pump fuel up to the carb now.
- Car was able to start and run for a few seconds but then it dies off. Fuel is overflowing the triangle part of the carb that is where the fuel lines come into it. The overflow drops down into the barrels, and then the engine dies.
- I unplug the fuel pump, and then the engine starts but then dies because no fuel gets into the engine.

So my problem is either:
Pump on = flooding the engine
Pump off = starving for fuel

Can some one help me? It has taken a lot of work but I am slowly getting the buggs determined. So the problem is carb or something close to that.

Stevan

iTrader: (17)

I think so, rebuild the carb.
It sounds like the needle and seat are not seating.

I don't know about the gas in the canister.

The fuel pump cut relay prevents fuel being pumped unless the engine is "turning". It won't pump fuel with just the ignition on, you have to turn the key to the start position.