Engine Overheating
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
The jet kit, I think it's the 1487 for the 1406 carb and this video will help improve your mpg
Then troubleshoot the places where you're giving up horsepower will help with the mpg also. 7mpg is not good 
I get 10mpg in my F350 2wd 460 with a c-6 tranny.
Is yours an auto tranny?
I get 10mpg in my F350 2wd 460 with a c-6 tranny.Is yours an auto tranny?
Thread Starter
|
Freshman User
Joined: Jan 2021
Posts: 31
Likes: 0
Thanks redroad! Funny thing is I've actually got that kit already awhile back and have checked the carb floats 3 times as well as adjusted my metering rods, springs, and jets. Also rebuilt the carb when I first got the truck. I also got a new accelerator pump. I basically tweaked all of those things until I was able to get rid of a big hesitation on initial acceleration. The only thing I didn't change was the jets on the secondary's as well as didn't switch out the squirters. I did purchase a set of squirters but didn't switch them out because I fixed my hesitation without having to and also figured that would only increase the fuel consumption if I went to a larger diameter squirter. I also put an inline fuel pressure regulator and set it at 5.5 psi because I read a handful of articles that said that was ideal for this engine. Looks like I need to do some more tuning to see if there is something more I can do or dial it in a bit more. Your 10 mpg sounds amazing now compared to my 6.9! haha. Also, my tranny is an auto as well. I've attached the two videos that I used, along with the one that you posted, to do my best at tuning the carb. Eventually I'll get this truck dialed in... and not guzzle gas. 
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
The C-6 transmission is HP Hungary and if it's worn and slipping your wasting fuel. Changing the timing chain set to a 1971 set will get rid of the emissions retarding and reclaim the horse power lost there. Putting on dual exhausts will give you some HP back as well. All these things are worth while but take time to accomplish. Best of luck
Thread Starter
|
Freshman User
Joined: Jan 2021
Posts: 31
Likes: 0
Following up... I replaced my thermostat with a RobertShaw high flow 195 degree one and then took the truck for a drive and the temp gauge needle hardly ever moved past vertical where it used to live on the right side of the gauge. Looks like the thermostat was my issue! Thanks so much for all of the help! As a follow up, I did take a look at the radiator tubes when the coolant was down low enough to look in the cap and see and they all look free of obstruction so for now I'm thinking I'm good there. I did notice that my coolant could hardly be called clean and I honestly don't know when the last time it was replaced being I just got the truck a couple months ago so this weekend I'll be draining that and putting in new coolant and new hoses. Didn't want to do that until I knew for sure that I wouldn't have to turn around and drain it again if the thermostat didn't fix the problem.
Again, thank you every one for you help!
Again, thank you every one for you help!
Thread
Thread Starter
Forum
Replies
Last Post
jasindude1
1978 - 1996 Big Bronco
4
Mar 29, 2021 09:46 AM
quakerj
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
9
Dec 24, 2014 12:43 PM
78ems
1967 - 1972 F-100 & Larger F-Series Trucks
15
Nov 25, 2013 10:49 AM
Davemandu
Cooling, Heating, Ventilation & A/C
2
May 1, 2011 04:48 PM
timbersteel
1987 - 1996 F150 & Larger F-Series Trucks
20
Oct 1, 2007 05:28 PM
