[tkklemann]

To All:

Thought I would post this since there has been some discussions about E85, and the black gunk stuff that builds up on the ends of the injector tips..

This weekend I did a lot of checks on the car, as well as do a few modifications to my fuel system as I am having a hard time with fuel delivery on a single Walbro 255, FIC 1050's and a maxed out IX Turbo. The fueling issues developed over time, so I had a feeling that something else was taking place, rather than a single part not being up to the task immediately.

Some background/information on the motor:

2.0 Built ~9.8:1 Compression
Single Walbro 255 (GSS342)
FIC 1050 Injectors
Perrin Fuel Rail
FPR (Bolts to Fuel Rail, Don't recall who's it is)
All Stock Fuel Lines
~32psi spikes to 24.5 redline on a IX Turbo (Hallman MBC)
Injector duty cycles are climbing higher and higher over time. (?)


I pulled the pump assembly, smacked in the pressure regulating valve thing in the Walbro, moved the battery to the trunk, re-wired the pump on its own relay, pulled the injectors out all to have a look see as I will this weekend be traveling with the car up to NY from Charleston. Over time the car has been running more and more lean, as if the pump wasn't able to keep up really anymore. I was starting to get sputtering and backfiring as the car was leaning out under heavy loads/boost, so I decided to try and see what was going on inside the fuel system. (Plus, I have a complete fuel system going in the car later, so I wanted to prep it for the full install. (Fullblown twin pump, Fuel Lab filter, Fuel Lab pressure regulator, all new lines converted to AN fittings, -8 feed and -6 return and am going to run both pumps all the time..)

Now, onto the pictures. I pulled my FIC 1050's and that's what I found. Now, the car has had only ~4,500 miles put on it since I completely redid the motor. The car has been on e85 for almost two years now, but this is the first I have seen this really start to get this bad. Prior to building the motor, the injector tips never did this.

Onto the cleaning; I tried several things, and Seafoam tore through that black stuff like it was nothing. So, I decided to continue using it. I must admit, I am kind of inclined to put some in the tank from time to time seeing as how good it was at removing the stuff. Simply setting the injectors in the Seafoam for about 15 minutes made the mess in the cut off bottle as shown in the picture. I am very curious as to what the tops of the valves look like now due to the buildup at the injector tips. I wish I could somehow see them without removing the manifold. (Anyone have any ideas?) I took a picture where you can see about 1/4" into the injector bosses on the manifold though.

The Pump; everything looked ok here, nothing out of the ordinary. Pump has seen everything from 110 leaded, C16, E85, 93-87 from all different gas stations. The pumps life was mostly spent on 93 & E85 with E85 edging out 93 now.

The FPR; Something is wrong in there, I tried adjusting the screw as I noticed the pressure was a touch higher than I wanted it, and I moved the screw all around to no avail. Pressure did not budge at all no matter what I did with the adjusting screw. I do remember while rebuilding the motor, I initially redid the fuel system and found my FPR was all caked white inside (It's aluminum) to the point I was surprised it was still somewhat working. I am going to pull it probably tonight and see what I find. (Ran out of time last night) I will take pictures of what I find and post them here.

Anyhow, I wanted to put this together just to get some information out there. This in no way should be taken that there is evidence of a problem with everyone's set-up's, this is only to show you guys what is happening with MY particular set-up. You might find the same, you might not.

So, lets discuss...