Low gas milage
Hi, I'm new to this forum. Looks pretty tight and lots of good answers to peoples questions.
I bought a 1991 f150 extended cab with 6 cylinder inline 4.9 motorwith 140 K miles . The fellow i bought it from swears he was getting around 14 in town and 19 on the highway. I'm getting a good soild 9 per gallon around town. I've done the following: >replaced battery wires. >changed air and crankcase filter. >installed new muffler(old one was mostly not there. The whole back of it was missing" >replaced fuel pump in mid tank Aside from the above i tightened 5 out of 6 of the sparkplugs. Some where really loose. I notice it idles high. Also it seems to run way cool. My next step is going to be to replace the thermostat and the sending unit. I havn't run any codes on it yet. Thanks for any help Rich |
Originally Posted by desertmariner
(Post 3625647)
Aside from the above i tightened 5 out of 6 of the sparkplugs. Some where really loose. Rich
Originally Posted by desertmariner
(Post 3625647)
I notice it idles high. Rich
Originally Posted by desertmariner
(Post 3625647)
Also it seems to run way cool. Rich
Originally Posted by desertmariner
(Post 3625647)
My next step is going to be to replace the thermostat and the sending unit. Rich
Originally Posted by desertmariner
(Post 3625647)
I havn't run any codes on it yet. Rich |
as it has high idle do you hear any hissing or notice a vac leak, this could make the high idle wich result in low mileage
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what trans do u have? and how do u drive i get 16 city in mine without over drive but if i beat it i only get 12 or so
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Hopefully he got his issue resolved...it has only been two and a half years.
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my mistake, was looking for info about my thermostat an since my mileage is getting worse i took a look at this thread and forgot the date :p
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up date of poor gas milage
It has been a while ......Part of my bad gas mileage is because i have dual tanks . The front tank recirculates into the rear. In calculating the mpg i didn't know gas was being sent to the rear......Duh.... I still sense it's a gas hog.
why would the front tank dump into the rear....anyway! |
Its a common problem and there was a recall to fix it.
Easy solution: Fill both tanks Run on the rear till near empty Switch to the front Run on the front till near empty Switch to the rear Re-fill and repeat |
These captions explain how the '90-96 fuel pump works, and why it can transfer fuel between tanks. There's also a link to the recall.
https://www.supermotors.net/getfile/...mbnail/j-3.jpg |
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