Flexfuel sensor install / return line modification for 7/8/9 above intake manifold
Thread Starter
Joined: Mar 2007
Posts: 1,737
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From: Midwest USA
Flexfuel sensor install / return line modification for 7/8/9 above intake manifold
Thinking of installing my flexfuel sensor in/on the stock return line coming out of the regulator.
This would require either fabricating another "hard" return line with clips that mate to my sensor or brazing the correct mating pieces into the OEM hard line.
Because this sensor is not exactly small I would build a bracket that it can mount to, and mount one end to the 2 bolts that hold the throttle cable bracket to the intake manifold.
Anyone try anything like this or have any suggestions/opinions/ect.
Anything constructive is welcome.
This would require either fabricating another "hard" return line with clips that mate to my sensor or brazing the correct mating pieces into the OEM hard line.
Because this sensor is not exactly small I would build a bracket that it can mount to, and mount one end to the 2 bolts that hold the throttle cable bracket to the intake manifold.
Anyone try anything like this or have any suggestions/opinions/ect.
Anything constructive is welcome.
The flex sensor is equipped with tubing that accepts standard push lock EFI connectors. I recommend you bolt it to the firewall using the stud just above the heater feed and return hoses.
See here: https://www.evolutionm.net/forums/at...position-2.jpg
Use fuel hose and some barbed EFI connectors to plumb it into the return hose. This will be easier than trying to braze it into the return line above the intake manifold, which is actually cadmium plated steel tube.
See here: https://www.evolutionm.net/forums/at...position-2.jpg
Use fuel hose and some barbed EFI connectors to plumb it into the return hose. This will be easier than trying to braze it into the return line above the intake manifold, which is actually cadmium plated steel tube.
Last edited by CDrinkH2O; Oct 12, 2014 at 12:20 PM. Reason: Added pic
Thread Starter
Joined: Mar 2007
Posts: 1,737
Likes: 112
From: Midwest USA
The flex sensor is equipped with tubing that accepts standard push lock EFI connectors. I recommend you bolt it to the firewall using the stud just above the heater feed and return hoses.
See here: https://www.evolutionm.net/forums/at...position-2.jpg
Use fuel hose and some barbed EFI connectors to plumb it into the return hose. This will be easier than trying to braze it into the return line above the intake manifold, which is actually cadmium plated steel tube.
See here: https://www.evolutionm.net/forums/at...position-2.jpg
Use fuel hose and some barbed EFI connectors to plumb it into the return hose. This will be easier than trying to braze it into the return line above the intake manifold, which is actually cadmium plated steel tube.

If I went with my original idea I'd probably have a line made so I can replace the factory line instead of brazing it in. I have to think about this more.
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firewall is going to be a cooler location than above the intake manifold. i plumbed mine without efi connectors by using larger size hose in combination with reducing barb unions to connect to the factory diameter hose.
Thread Starter
Joined: Mar 2007
Posts: 1,737
Likes: 112
From: Midwest USA
Project has been completed and documented better in another thread here:
https://www.evolutionm.net/forums/e8...l#post11475392
https://www.evolutionm.net/forums/e8...l#post11475392
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