FE Power Forums

FE Power Forums => FE Technical Forum => Topic started by: CV355 on July 20, 2020, 09:25:57 AM

Title: 1969 vs 1970 Mustang Fuel Tank Question
Post by: CV355 on July 20, 2020, 09:25:57 AM
I just installed a 1970 fuel tank with a rear sump fab'd in into a 1969 Mach 1.  When I went to reinstall the fuel filler neck, it appeared to be at the correct angle, but off by about 1.5" or so axis-to-axis.  Before I chop and fabricate a new fuel filler neck, I'm curious if the 1970 Mustangs had a slightly different neck that I can just purchase and swap in. 
Title: Re: 1969 vs 1970 Mustang Fuel Tank Question
Post by: jayb on July 20, 2020, 10:01:49 AM
National Parts Depot has a filler neck for making that swap.  I've seen it on their web site before, but I wasn't able to find it just now.  I'd give them a call...
Title: Re: 1969 vs 1970 Mustang Fuel Tank Question
Post by: CV355 on July 20, 2020, 10:11:25 AM
Quote from: jayb on July 20, 2020, 10:01:49 AM
National Parts Depot has a filler neck for making that swap.  I've seen it on their web site before, but I wasn't able to find it just now.  I'd give them a call...

I'll look into that, thank you!!
Title: Re: 1969 vs 1970 Mustang Fuel Tank Question
Post by: FirstEliminator on July 22, 2020, 01:38:28 AM
I've done that swap in a 69 Cougar using a 70 tank. I don't recall there being any fitment issues. Are you sure your tail light panel or filler neck has never been tweeked? Maybe the Mustang and the Cougar are different there? I thought those pieces would be the same.
Title: Re: 1969 vs 1970 Mustang Fuel Tank Question
Post by: Heo on July 22, 2020, 04:09:12 AM
Quote from: FirstEliminator on July 22, 2020, 01:38:28 AM
I've done that swap in a 69 Cougar using a 70 tank. I don't recall there being any fitment issues. Are you sure your tail light panel or filler neck has never been tweeked? Maybe the Mustang and the Cougar are different there? I thought those pieces would be the same.

The 69 tailpanel bows inward and the 70s bows outward while the cougar have
The lightramp perhaps that's why
Title: Re: 1969 vs 1970 Mustang Fuel Tank Question
Post by: CV355 on July 22, 2020, 07:11:13 AM
The 70 tank is slightly taller than the 69 tank, but the fuel neck is the same angle.  I basically need to extend the pipe right after the flange and then cut the excess from the bottom for the pipes to line up. 

I did look into the NPD/CJPP adapter, but it looks like it is a different angle and unfortunately not in stock anywhere. 
The taillight panel isn't tweaked or damaged, as far as I can tell.  The body and frame on this car are pristine. 
Title: Re: 1969 vs 1970 Mustang Fuel Tank Question
Post by: Joe-JDC on July 22, 2020, 08:30:00 AM
20 gallons vs 22 gallons.  Joe-JDC
Title: Re: 1969 vs 1970 Mustang Fuel Tank Question
Post by: CV355 on July 22, 2020, 01:21:19 PM
Quote from: Joe-JDC on July 22, 2020, 08:30:00 AM
20 gallons vs 22 gallons.  Joe-JDC

Yeah, that's definitely it.  Didn't anticipate for the 22gal when I bought the sump tank.  Definitely not complaining, the 2 extra gallons will be my "reserve" with the 69 sending unit.  I dont anticipate this new engine getting good gas mileage...  If I get 12, I'll be happy. 

I'm going to chop this thing up and re-weld it.