How soon does E85 create "black goo"?

[CrackedDSM]

Hey guys, kinda a simple question. How soon have you heard of or personally noticed E85 clogging a fuel system with the infamous "black goo"?


I'm like one tank, maybe two tanks into full E85 and I'm wondering if my random lean issue during boost is from the fuel system clogging. This car sat for a long time(8+ years), but I've run like...15+ tanks of 93 Octane since then, and changed the fuel filter. Less than a tank or two later, I switched to Full E85.


How soon have you noticed an issue? Does it usually take awhile, or is it like...immediate?

 

[jamel16]

I noticed mine after about 3-4 tanks of fuel. I just ran a little 93 to clear them out.

 

[97egl]

Hey guys, kinda a simple question. How soon have you heard of or personally noticed E85 clogging a fuel system with the infamous "black goo"?


I'm like one tank, maybe two tanks into full E85 and I'm wondering if my random lean issue during boost is from the fuel system clogging. This car sat for a long time(8+ years), but I've run like...15+ tanks of 93 Octane since then, and changed the fuel filter. Less than a tank or two later, I switched to Full E85.


How soon have you noticed an issue? Does it usually take awhile, or is it like...immediate?

The black goo is probably from the E85 cleaning all the varnish in the tank from sitting for 8 years as well as just cleaning the fuel system in general. I've cleaned varnished fuel tanks by filling them with several gallons of e85 and then setting it in different positions over a week or so and the tanks clean up VERY well. So I can tell you it doesn't take long to clean the tank. How long it takes to make its way up to the fuel rail I'm not sure. Every car I've bought has been sitting forever and had a nasty tank so I've always cleaned them before running e85.

 

[MindBlowin03]

I've been running e85 for probably 7 years now and never actually seen the black goo. I pull my injectors pretty much every year and they always look clean. To be fair, there other only 3000-4000 miles in those 7 years.

 

[1990TSIAWDTALON]

I have never ran into black goo since I started running E85 years ago. Now the invisible "slime".....IDK where that shit comes from. It clogs my 10 micron filter when it is present. I run the same fuel in both E85 cars so I don't believe the stuff I was encountering was just the fuel itself.

 

[CrackedDSM]

Well, black goo and clogged fuel system wasn’t the problem. This was.

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Stay far far away from Aeromotive fuel pumps. Have a Walbro 525/Hellcat fuel pump on order now. This thing isn’t even a few months old.