4.6 crown vic: Can a pre 1991 fuel system work on a 2003 engine?

3 posts 2 contributors 1,790 views

sscott47150OP

Member since Jan 2011
2 posts
new albany, IN, USA
1 vehicle in the registry

Jan 8, 2011 at 6:16 AM

I see that the 1991 crown vic fuel system uses a supply and return line.
Since I am using a 1991 frame + fuel tank under my 1941 Ford, but putting in a 2003 crown vic motor that only uses the supply line, no return line.
My preference is to use the 1991 fuel system, but that may not be a option.
If anyone has any input on what the best direction would be, it would be welcome.
I have previously put a 1996 4.6 in my 1965 Galaxie, and it worked out great, but this is new ground for me.
Thanks

jdmeaux

Member since Jan 2009
525 posts
Lafayette, LA, USA
1 vehicle in the registry

Jan 8, 2011 at 9:13 AM

The "returnless" fuel systems have to be used as a returnless fuel system. It's programmed into the computer. If you go to a regular return system, the computer will have to be reflahed or the computer for a regular return fuel system will ahve to be used.

*******************
PROUD MEMBER of www.crownvic.net

It's just a SUPER-DUTY Mustang GT Sedan. 198K miles and still rolling HARD.

1997 Crown Victoria P71 SVT *** ex-US Marshall service (the CAR)
STOCK?? I bet it was modified.

13.26 @ 107.24 MPH 1/4 mi w/ me, tools, & full tank of 93 octane

I added CAI, NICHE 19 X 8.5 " wheels with 245/45ZR 19 rubbers, and completely rebuilt the front end with poly bushings, Kooks headers, 2 1/4inch exhaust, TCI 2200-2400 rpm Stall converter

.PLANS:: engine upgrade, 5.4L 2v stroker, rebuild interior in leather w/ buckets, thinking about turbos

sscott47150OP

Member since Jan 2011
2 posts
new albany, IN, USA
1 vehicle in the registry

Jan 17, 2011 at 5:53 PM

Thanks for the info.
Makes sense to stick with the complete 2003 system, front to back.

Know the answer? Join free to reply. This community has answered Ford questions for 25 years, and threads like this one stay up to help the next owner. Join free