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Username Post: Fitech Installation        (Topic#357771)
"10th Year" Gold Supporting Member
Posts: 96
Reg: 04-20-04
08-23-19 12:55 PM - Post#2773888    

Putting Fitech FI on my 65 Imp SS and I need a vented gas cap brand and P/N that reaches down far enough into the tank to engage when you turn it to close. Everything installed nicely. Just waiting to turn the key and start but not without a fix.
Got a problem with the fuel return line "Tee" passing too much gas out through the actual tank vent line when the injection fuel command center gets too full. So I think I need to put the return fuel line directly to the tank vent pipe and add a vented cap. I might have to drill a cap, but maybe there's already a good vented cap that will work on these tanks. Didn't want to pull the tank or replace with one of them new fangled FI ready tanks.


Posts: 146
Loc: Forest Hill MD
Reg: 10-28-13
08-28-19 04:07 PM - Post#2774326    
    In response to bulkhed

I have the FITech system on my 66, and had the same problem. I was going to drill and tap the filler neck to install a fitting and connect the vent from the fuel command module there. I wound up just changing the tank and put the pump in the tank. Looking back, is it possible that the float level is just set too high? Try adjusting the float level down and see if it stops.

66 Impala convertible
66 Biscayne 427 2 door post
66 Caprice 4 door hardtop
66 Caprice 2 door
81 Corvette
96 DGGM Impala SS
01 S10
15 Silverado
2003 Crown Victoria LX Sport "Icky Vicky"
1965-66 FSCC member #530

"8th Year" Gold Supporting Member
Posts: 404
Age: 60
Loc: Albany, eNZed
Reg: 11-04-12
08-28-19 07:30 PM - Post#2774350    
    In response to centsless

I also have Fitech on my '66. I fitted the Tanks Inc tank with in-tank pump. Would recommend you do same.

I think the vent on the 66 is way too small to use as a return. I think there are later Chevy fuel gauge senders that have a return fitting. You could remove the sender & add a return pipe to it also.

A vented cap is likely to leak fuel under acceleration or when going uphill.

1966 Caprice 396 496 496mkII TH400

Very Senior Member
Posts: 4559

Reg: 12-29-02
08-29-19 05:40 AM - Post#2774377    
    In response to bulkhed

A fuel cell bulkhead fitting or something else similar can work to add a return line without welding. Just drill a hole in the tank or sender and bolt it in.

On another note, It doesn't matter if the FCC is pressurized by the mechanical pump so you could also just put a restriction (near the FCC) in the return line and limit the return fuel flow enough it doesn't overflow the vent.

"10th Year" Gold Supporting Member
Posts: 96
Reg: 04-20-04
09-09-19 08:58 PM - Post#2775206    
    In response to 65_Impala

That's something I hadn't thought of. Thanks for the idea.


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