RB26 fludding with fuel need advice.

[89 GTR R32]

My rb26 keeps fluding it self with fuel. I have put new injector seals, new plugs. The injectors don't look like they have any probablems but I might be wrong. I was thinking mybe the MAFs because when I was installing my sr20 in my 240 it ran like my RB till I fixed the probablem with the MAF. I don't really know just looking for some advice or opinions.

[mello88]

Stock FPR on Walbro?

[Sil240]

I highly doubt that would be the prob.He would just run rich.Unless his FPR is stuck closed.

I would check that maf too. Clean that bad boy out

[Sykoperformance]

Check the FPR. If the diaphram is torn, fuel will dump directly into the intake through the vac. hose. Easiest way to inspect is to pull the vac hose and see if it's wet with fuel.

If this checks out, check voltages from AFMs.

[rotorimp]

Is the ECU seeing the correct engine temp? A motor will flood if the ecu thinks the motor is still cold--can you pull any codes?

[89 GTR R32]

Were would the that hose be?

[89 GTR R32]

I don't really have access to that kind of equipment.

[Shocker]

I don't really have access to that kind of equipment.

its the rubber line that attaches to your stock FPR that is located on the fuel rail close to your cam cover/upper rad hose area, it goes to your Intake Plenum. Just pull of the hose off from the intake manifold side, and have a look see.

[Sykoperformance]

It's the small vac. hose on your FPR. It doesn't even have a clamp. Can probably pop it off with your hands or use a screwdriver to pry it off.

If you got no tools, you might not be able to check the engine coolant temp sensor or the AFM voltages.

Are you sure the engine is running rich and flooding? Will it start? Any smoke or fuel out the exhaust? If you can get some tools, pull the plugs to confirm the rich mixture.

[89 GTR R32]

The plugs were covered with black sut. black smoke coming out of the exhasut to. When I let the car set over night and get all the fuel out of it, then start it the next day it runs fine till I give it some gas then keeps spudering and has trouble running and black smoke comes out of the exhaust along with some gas.

[Sykoperformance]

You are describing all the sign of a rich mixture. Start by checking everything mentioned above and let us know if you find anything.

[89 GTR R32]

I have checked the MAFs and the FPR but niehter show any probablms. Idk might be on of the injectors screwing up on me.

[Sykoperformance]

What kind of voltages did you get out the AFM's? If you're using a stock ECU, try unplugging both AFM's and start the engine. It should run but will cut out around 2500 RPM. Try this and see if it runs any better.Did you check the coolant temp sensor yet?

[89 GTR R32]

I unplugged the mafs today and let it run. It seemed to run fine. But there is still soot died gas coming out of the tail pipe. With the mafs hooked up it would run for a while then I would give it some gas and it would akt up again but when it would screw up and start fludding it self with fuel it wouldn't let the car run past 4,500rpms. What do you think?

[Bluefire]

What kind of modifications/upgrades do you have done... list everything

Also do all the spark plugs look the same? Or are there some that are richer than others...

-Bluefire

[Sil240]

Do you think that maybe your injectors are not closing properly?????

Try a someone else's injectors or send yours out to be cleaned. Can't hurt having cleaned injectors. Something like $20 each or so...

[89 GTR R32]

Mods done to the car include a set of air filters and a an half exhaust for the the cat back. When I pulled the plugs out and replaced them they all were socked in gas and had black soot on them.

[89 GTR R32]

What like take the injectors to a Nissan dealership and get them to clean them. I have 2 gueses of what it could be. I think it is either the injectors or the MAFs I think.

[k4rr]

O2 sensor is my first guess!! Replace it asap!

Coolant temp sensor. replace with a new one.

Or leaky injectors. Take off the rail and put it on a rag with everything still hooked up. fuel lines, and injector wires, And see if they leak

Bad FPR maybe. get a pressure gauge and check.

Check your timing too with a timing light or nissan consult.

Maybe bad maf.

Unplug your mafs and drive the car see if it still runs rich in limp mode. If it doesd the maf is not your issue.

You may have a combo of these. So start replacing them and testing them all one by one.

Make sure you keep your OIL CHANGED!! The fuel will mix with your OIL when you are running rich!!!! And will kill your bearings!!! Change it everday if you are driving this car around!!! I am not bull****ting!! Your motor will die.

[Sil240]

What like take the injectors to a Nissan dealership and get them to clean them. I have 2 gueses of what it could be. I think it is either the injectors or the MAFs I think.

No, you Nissan dealer wont clean injectors.

RC eng, Deatchworks etc....Most places that do injectors clean them and flow test them.You will find out which injector is running X # of cc's.Then you can stick the highest flowing on in the 6th cyl

You can also check them yourself (ghetto way)Take them all out.Clean them off (very well)Then get 2 wires with aligator clips (the kind with a rubber sheath around them) and hook each to the leads on the injector and hook them up to the battery.Check your FSM for which one is Ground and which one is positive.

Hook up the positive and then Ground out the injector to fire it.See if they are all moving.

[sil80hks]

Hey guys, old thread but it's all I found on this issue. I'm having the same problem(somewhat). Stock rb26 running fmic, McKinney down pipes, 3" exhaust, stock ecu.

Starts fine in the morning or on cold start. After running a while and then shutting it off it won't start back up. The only way to get it going again is unplugging the fuel line that goes from the fuel filter to the fuel rail. It'll blow out a bunch of gas then I plug it back in. After doing this it ill crank a few times and start right up.

Thinking the fpr is stuck and not allowing fuel to return this flooding the engine? Maybe injectors stuck open?

Anyway, any help on the issue is appreciated. Kind of sucks having to do that every time I turn it off to pump gas just to get going again...

Ps the car runs fine once it's going, just runs a bit rich(fuel smell out exhaust)

Thanks,
Jerry