2G Fuel Flooding The Motor

[Gst_hector99]

Coming to you guys for some help about this problem I’m having where my block is getting flooded with fuel I’ve tried fixing it but can’t figure out why it’s doing it!! What are some ways I could figure out what’s causing this and fix it? I’ve tried a lot of ways but isn’t working.

 

[chrisman287]

What have you tried so far?

 

[Gst_hector99]

What have you tried so far?

So I’ve tried swapping the injectors with the other one next to it and it did the same thing so ik it isn’t the one injector itself then I tried swapping the injector connectors to see if its a wiring issue and did the same thing and mind you this is on the stock 2g 99 injectors too! Then I was thinking it was maybe a leaking problem so I took them to a guy that got them cleaned and leaked tested he said everything was good put them in and still it was pouring out lastly I tried some bigger injectors put them in and is doing the same

 

[97egl]

Your description "The block is flooding with fuel" is very vague. You need to be more specific as to what you are seeing. Are you pulling a plug and it is always wet? Are you seeing fuel leaking from the injector externally?

 

[Gst_hector99]

Your description "The block is flooding with fuel" is very vague. You need to be more specific as to what you are seeing. Are you pulling a plug and it is always wet? Are you seeing fuel leaking from the injector externally?

True true lemme provide some videos

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Here is another so I did unplug the coil packs so there wouldn’t be spark

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[97egl]

The motor sounds like it has a gallop when you are cranking. It could be the massive amount of fuel starting to hydro lock it slowing the cranking down but also could be that you don't have compression on those cylinders. If there isn't any compression the cylinder will get flooded with unburned fuel.

Have you checked for compression and spark?

 

[Gst_hector99]

The motor sounds like it has a gallop when you are cranking. It could be the massive amount of fuel starting to hydro lock it slowing the cranking down but also could be that you don't have compression on those cylinders. If there isn't any compression the cylinder will get flooded with unburned fuel.

Have you checked for compression and spark?

So I haven’t done no compression test but I did unplug the spark plugs so I wouldn’t get spark when cranking for when I was testing if maybe I had a stuck open injector

How could I figure out if it’s getting hydro locked or if it’s cause of low compression cause I wasn’t trying to start her up with cranking her since all that fuel is getting into the oil I was testing if the injectors or the wiring was bad. my thought process was I don’t think it’s the injectors now it’s something with wiring since something is telling the injectors to stay open? What else do you think

 

[pauleyman]

Please start from the beginning. What led you to this? Car was running but now isn't? Car has never ran in your possession? You recently made a repair and now this happened? Car broke down? What happened to get you to this point?

 

[Gst_hector99]

Please start from the beginning. What led you to this? Car was running but now isn't? Car has never ran in your possession? You recently made a repair and now this happened? Car broke down? What happened to get you to this point?

Okay basically blew it within the first month of having it. Bought the car was fine till I turned the boost controller all the way up and was pushing 35psi on stock everything.

IDK how but then tore apart the whole engine then got a built block that was sent to MAPerformance. Sent the head to a machine shop, then did timing also put in a Walbro 450 and everything on that motor was brand new, oil pump sprockets shaft delete etc. It was sitting in my garage while I was constantly working at it then finally got the time to go at it fully.

Now we’re at the part where it’s all in the car and had everything ready to start. I turn it on after it sitting for months everything went good on the first start up (I could show a video of how it did) then I’m all happy about it starting up.. Next day I try to start it up again and a bunch of oil and coolant was leaking from the bottom. Figured it all out, fixed it, then went to start it back up again and seen something was leaking from the bottom corner of the exhaust manifold, unbolted it and it was just all fuel so everything was all working before when I first got the car and also everything worked on the first start up after it was sitting.

Now it isn’t wanting to stop pouring out fuel, so I tried swapping out the injectors to see maybe this one injector is bad so I did and it was the same and what I mean by the “same” is it’s still spewing out a bunch of fuel so now I’m thinking it’s the wiring. So I swap the injector connectors and it did the same thing, then I have these bigger injectors I’ll eventually run put them in to see if it’s the stock 99 2g injectors so I do it. Nope it’s still pouring out.

I swapped the connectors again, still doing it. Now I’m at a point where there’s fuel everywhere and I’ve been through 7 oil changes cause obviously I don’t wanna keep cranking when the oil is all fuel and yea I’m here now asking for help on how to fix this

 

[97egl]

If you crank it with the injectors all unplugged are you still getting fuel pouring out? If so check the vacuum line coming from the fuel pressure regulator. If the diaphragm is blown out they can dump fuel into the intake.

 

[Gst_hector99]

If you crank it with the injectors all unplugged are you still getting fuel pouring out? If so check the vacuum line coming from the fuel pressure regulator. If the diaphragm is blown out they can dump fuel into the intake.

I also did that and it would just crank out all the remaining fuel that was still in the motor

 

[97egl]

I also did that and it would just crank out all the remaining fuel that was still in the motor

But it did clear up at some point?

 

[Gst_hector99]

But it did clear up at some point?

Yea this is the video of all the injectors unplugged

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[97egl]

Yea this is the video of all the injectors unplugged

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That doesn't look like it's clearing up to me. Probably easier to tell in person tho.

I would pull the vaccum line off the fuel pressure regulator and see if you have gas spraying out of it. You may have to crank the engine over to get the fuel pump to create pressure. Not sure if 2g cars will run the pump without seeing the engine cranking.

 

[Gst_hector99]

That doesn't look like it's clearing up to me. Probably easier to tell in person tho.

I would pull the vaccum line off the fuel pressure regulator and see if you have gas spraying out of it. You may have to crank the engine over to get the fuel pump to create pressure. Not sure if 2g cars will run the pump without seeing the engine cranking.

Well you do have a point there was a lot still in there but near the end it isn’t so much fuel but so I pull off the line on the regular and fuel is supposed to squirt out right and do I keep the injectors pulled in or unplugged?

 

[97egl]

Well you do have a point there was a lot still in there but near the end it isn’t so much fuel but so I pull off the line on the regular and fuel is supposed to squirt out right and do I

Leave the injectors unplugged as well as the coils. You don't want the car trying to start. Pull the vacuum line off the regulator and then have someone crank the car over for just a second or two while you watch the regulator. Fuel should NOT come out of the vacuum line but if it does that verifies the regulator is bad and flooding your intake with fuel.

You may also want to check that the fuel return line that comes off the regulator is routed to the fuel return line on the firewall and not accidentally routed to one of the vacuum ports on the intake.

 

[SixBolt_16G]

Apologies for getting super basic, but you are running something like an Aeromotive or Fuelab AFPR and not trying to run a Walbro 450 off the stock FPR and completely overrunning it, right?

Can't see the rest of your engine bay to tell and no upgrade for it listed in your profile.

 

[Gst_hector99]

Leave the injectors unplugged as well as the coils. You don't want the car trying to start. Pull the vacuum line off the regulator and then have someone crank the car over for just a second or two while you watch the regulator. Fuel should NOT come out of the vacuum line but if it does that verifies the regulator is bad and flooding your intake with fuel.

You may also want to check that the fuel return line that comes off the regulator is routed to the fuel return line on the firewall and not accidentally routed to one of the vacuum ports on the intake.

I got it all ready just waiting for someone to get home so that I could get a jump

Apologies for getting super basic, but you are running something like an Aeromotive or Fuelab afpr and not trying to run a Walbro 450 off the stock fpr and completely overrunning it, right? Cant see the rest of your engine bay to tell and no upgrade for it listed in your profile.

It’s good and yes it’s on stock fpr… could that be it!?

 

[SixBolt_16G]

It’s good and yes it’s on stock fpr… could that be it!?

Yes.

Second question...

... are you running any type of tuning software like DSMLink/ECMLink to control the fuel from those upgraded injectors?

 

[Gst_hector99]

Yes.

Second question...

... are you running any type of tuning software like ECMLink to control the fuel from those upgraded injectors?

So for that I only put them in to check if my stock injectors were acting up or the wiring and it still was pouring out fuel with the bigger injector which I know there isn’t any problems with them. So when I have it running it’ll be on stock injectors for a bit till I can drive it and see if everything is running good then I’ll do that swap and get tuned for it

 

[SixBolt_16G]

So for that I only put them in to check if my stock injectors were acting up or the wiring and it still was pouring out fuel with the bigger injector which I know there isn’t any problems with them. So when I have it running it’ll be on stock injectors for a bit till I can drive it and see if everything is running good then I’ll do that swap and get tuned for it

I dont have the automotive background to know if the fuel pump/stock fpr is the ONLY issue that you have going on, but as far as fuel pumps go, you start getting into needing a apfr when you get to a Walbro 255 and larger. Shop i had my car at kept telling me i didnt need one when they put my Aeromotive 340 in (even tho they work with DSMs all the time). I was getting away with it too until i got the car home and put it in reverse. My wideband went super rich and my oil dipstick smelled of raw fuel. Put a Fuelab mini in myself. Problem solved. If you dont have a wideband, you should order one along with a afpr.

 

[Gst_hector99]

I dont have the automotive background to know if the fuel pump/stock fpr is the ONLY issue that you have going on, but as far as fuel pumps go, you start getting into needing a apfr when you get to a Walbro 255 and larger. Shop i had my car at kept telling me i didnt need one when they put my Aeromotive 340 in (even tho they work with DSMs all the time). I was getting away with it too until i got the car home and put it in reverse. My wideband went super rich and my oil dipstick smelled of raw fuel. Put a Fuelab mini in myself. Problem solved. If you dont have a wideband, you should order one along with a afpr.

Damm how didn’t they know if they work on DSMs but Okay so the way I would know for sure if I do need a AFPR is if I do what @97egl said to do was to pull the vacuum line off of the FPR and crank her with no injector connectors being on and see if fuel is squirting out of it!?

 

[SixBolt_16G]

Damm how didn’t they know if they work on DSMs but Okay so the way I would know for sure if I do need a AFPR is if I do what @97egl said to do was to pull the vacuum line off of the FPR and crank her with no injector connectors being on and see if fuel is squirting out of it!?

As far as I know, its not a question of whether you might need one, its that its a requirement to have one if you're going to run a 450.

 

[Gst_hector99]

As far as I know, its not a question of whether you might need one, its that its a requirement to have one if youre going to run a 450.

Ohhhh in that case what Brand is good !?

 

[SixBolt_16G]

Ive only seen others around here talk about Aeromotive and Fuelab. I can only personally vouch for the Fuelab mini that I installed has been problem-free.