I was just tuning a customers car and his vacuum line to his hobb switch to his double pumper setup blew off and here was the result. If you have this same setup in your car (which most of us do that run e85) please check your vacuum lines and dont let this happen to you..

The car is perfectly fine thanks to e85's cooling properties, but it could have gone bad real quick im sure.

notice the boost just took a dive due to the boost leak caused and when the car lost the 2nd fuel pump it instantly spiked 18 AFR+ lean.



My advice: Gorilla glue + zip ties!.. you can never have enough zip ties.. ask john shepherd.. he will say the same

So hopefully i avoid this from happening to someone elses car by providing this warning.

 

Yea sometimes I wish the Evo X tephramods had the failsafe 'AFR out of range' feature like it does on the 8/9

 

good point.. another reason to go ecu boost.

 

wow thanks for the warning!! can you post a pic on where it popped off? thanks

 

Tom then why in the hell did you keep going with the pull??? You should have seen it dip dead lean. What was knock on this?

Mikey

 

zipp ties save, jesus scores!

 

If it was an Email tune he wouldn't have known until the customer sent him the log.

I don't run a hobb's switch. Hopefully I won't have that problem.

 

this wasnt my car lol. it didnt register any knocksum.. but i can see the misfires in the log where timing gets pulled, but he said the car didnt break up, but it felt like it was in neutral with the gas pedal down

 

The beauy of E85

Mikey

 

Holy dogballs! Lucky!

 

The hobbs switch has a pretty large ridge on it. I think a ziptie with no glue would hold it pretty good. The vac line I worry about most is from the intake mani to the FPR. The nipple on the manifold is straight with not a bit of a flare on it. I am sonetimes tempted to tee off a different line for such a critical vac source.

 

my 2nd pump is wired to my F-Con and kicks on that way. i used to use the hobbs switch but removed that potential issue when i got the F-Con.

cant they make a way to kick on a second pump with the stock ecu?

 

Working on it and looks to be almost there:

https://www.evolutionm.net/forums/ec...p-control.html

 

this is exactly why im putting a led in dash activated by a 50 psi pressure switch between the second pump and a check valve. second pump doesnt kick, no light and i let off the gas.

 

what if the pump or relay fails? you get the same result.