20B flooded to the point it is leaking fuel on the floor - RX7Club.com - Mazda RX7 Forum



20B flooded to the point it is leaking fuel on the floor

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Old 06-17-17, 01:48 PM
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MN 20B flooded to the point it is leaking fuel on the floor

I had my primary and secondary fuel injectors on my 20B cleaned and tested by Injector Rehab. The car sat a few weeks before I had time to reinstall them. Once reinstalled, the car started, but I had to shut it off after it only ran for 10 seconds due to a loose belt (I replaced a pulley and had not set the belt tension properly). When I went to restart it, it was, of course, flooded. I pulled the plugs, cleaned them, reinstalled them and tried to restart it again. The only way I could get it to start briefly was by pulling the fuel pump relays. It started briefly and eventually died so I reinstalled the relays. I could not get it to start again so I pulled the plugs and they were soaked. At this point I noticed that there was fuel on the floor of my garage (an ounce or 2). The fuel is dirty (see pic) so I know it went through the exhaust. I can see it is leaking at the connecting point where the downpipe meets the rest of the exhaust system.

This car has flooded before, but I donít remember ever seeing it flood to the point where there was fuel leaking onto the ground. Iím not sure what I could have done during the fuel injector reassembly process to cause this issue, but I am open to ideas.


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Old 06-17-17, 03:57 PM
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Why was it flooding in the first place? Does the engine have good compression?
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Old 06-17-17, 04:11 PM
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What ECU are you running? Stock injectors?
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Old 06-18-17, 03:10 PM
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Wiring issue/Stuck Injector

I had this happen to us many of times. The first issue we found that one of the wires to the injector was shorting out and causing the injector to stay in the open position and another time the injector it self went bad and was stuck in the open position. If you pulled the fuel relay and ran the line dry that is why the die at that point. Which is some what of a good thing. You don't have a fuel leak. Check your wiring to the injectors make sure there are no bare wires that could cause a short. If you don't see anything wrong then move to the injectors themselves, now look at the head of the injector and make sure they are all in the close position. Check them by plugging the required voltage to them and make sure they go to the full open position and then release once power is removed. Observe this as close as possible. If they check out, then move to the ECU and see if they are preloading to much fuel during the start process. I know you said you sent the to injector Rehab and all things should be good, but if all fails to show the issue new injectors maybe needed.
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Old 06-18-17, 09:55 PM
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I had the same issue. Fuel coming out of connection between the downpipe and midpipe. My problem was leaky injector. So basically the injector's valve was leaking when the engine was not running. when I was tuning the car on and off with fuel pump prime as I'm working on the car, it was spraying fuel into my rotor #2. That's the only time I got the fuel dripping out of my exhaust pipe. Either your tune is wayy off or something's wrong with your injectors, or wiring (short like you said) if the fuel is coming out of exhaust pipe.

if you suspect leaky injector, you can check it easily with an air compressor. just take the injectors out, charge compressor to 40psi, seat the rubber tip of the blow gun tightly against the injector top end, then open the blow gun. if it makes any leaky sound, it's leaking. normal injector should make no sound.

Amazon Amazon

that's what I used and worked well.
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Old 06-18-17, 11:45 PM
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I had this problem one time when I put the primary injectors in my TII (top feed style) and didn't get them in quite straight so when I clamped it down by tightening the fuel rail it pushed the plastic pintle cap to the side .

When the injector opened the pintle caught caught on the edge of the plastic pintle cap and stayed open.

It ran kind of rough that way and I noticed fuel filled up the exhaust manifold and leaked out making a big puddle on the garage floor.

I always make sure my injectors can rotate a bit when I push them with my finger now after assembly.
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Old 06-20-17, 12:30 PM
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I've had a problem before where the map sensor was flipping out, giving a false reading of 1.2 bar AT IDLE, therefore the ECU dumping in monstrous amounts of fuel. Worth checking into... that or your tune is totally wrong.


To build on what BLUE TII said, you know an injector is properly installed when you can rotate it freely. If it is bound up / very difficult to move, you probably have an issue.
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Old 06-22-17, 08:29 AM
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Quote:
Originally Posted by stickmantijuana View Post
I had the same issue. Fuel coming out of connection between the downpipe and midpipe. My problem was leaky injector. So basically the injector's valve was leaking when the engine was not running. when I was tuning the car on and off with fuel pump prime as I'm working on the car, it was spraying fuel into my rotor #2. That's the only time I got the fuel dripping out of my exhaust pipe. Either your tune is wayy off or something's wrong with your injectors, or wiring (short like you said) if the fuel is coming out of exhaust pipe.

if you suspect leaky injector, you can check it easily with an air compressor. just take the injectors out, charge compressor to 40psi, seat the rubber tip of the blow gun tightly against the injector top end, then open the blow gun. if it makes any leaky sound, it's leaking. normal injector should make no sound.

https://www.amazon.com/Milton-S-148-...sor+air+nozzle

that's what I used and worked well.
Good tip for a quick check of sticking injectors.
I'll be sure to remember this one.
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Old 06-23-17, 09:25 AM
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I had this with stick injectors too.. Easy check good luck! Make sure and dry it all out thoroughly too! And check oil is not too contaminated.
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