Sudden Drop in Mileage?!
01-31-2003 | 11:47 AM
#1
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From: MidWest
Sudden Drop in Mileage?!
On average, I get about 400 miles to the tank. <br><br>However, the last two tanks of fuel only got me 250 miles?!?!<br>The truck still runs fine, I dont see any fuel leaking on the ground?<br><br>I have not checked the fuel lines (Return line) for leaks.<br>I have plan to change the fuel filter and oil this weekend.<br>I have a clean (New) air filter.<br>The truck starts and runs fine... just seem to be loosing mileage?<br><br>Anyone out there have any ideas on this? Could my timing have slipped?<br><br>I appreciate any thoughts or ideas on this one.... thanks<br><br>Rich.
01-31-2003 | 11:57 AM
#2
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From: Arcadia, WI
Re:Sudden Drop in Mileage?!
Sounds like good places to start. May have been a batch of poor fuel. Also check the fuel prefilter/heater. Also, do you drain a little fuel out with each fill to eliminate water?<br><br>Fuel prefilter R/R
01-31-2003 | 10:49 PM
#4
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Re:Sudden Drop in Mileage?!
That's about what I get on a tank now (400 or so), but during cold weather (last week down to 0*F), mileage drops like a rock. I notice a drop w/winterized fuels too. I know my timing is off, but not sure how much mpg loss is due to that. When my truck was new (after ~20k mi anyway), I used to get 550 - 600 miles/tank. Started dropping and never came back even in summer.<br><br>A weak or broken overflow valve will affect power & idle, but you'd most likely notice that. Mine ran very badly w/a bad overflow valve.<br><br>Have to watch speed carefully: I notice a big drop above 65 mph. Required hp to move at higher speed rises very rapidly; so even short trips @ high speeds can use more fuel than one might think... of course, I'm just guessing there... ;D<br><br>Hope to have my timing reset soon, so will find out how much difference in mpg it makes.<br><br>Regards,<br>-Scott<br><br>
02-01-2003 | 06:19 PM
#5
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From: MidWest
Re:Sudden Drop in Mileage?!
Well, I spent this morning checking everything out.. cant seem to find any visable problem.<br>I'll get the truck in next week and have the timing checked.<br><br><br>Thanks.<br><br>Rich
02-01-2003 | 07:32 PM
#6
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From: Radford, Virginia
Re:Sudden Drop in Mileage?!
Well I doubt this is the problem but, buddy of mine had the same problem with his 90 F150 4x4. It was getting like 19mpg then just all of a sudden it went to 10mpg. We checked everything, come to find out the U-joints had went to the bad. I doubt this is your trouble, but I dont think it would hurt to check it out. Just my $0.02.<br>
02-02-2003 | 09:02 AM
#7
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From: Greenville, South Carolina
Re:Sudden Drop in Mileage?!
Here is 2 more cents.<br><br>My 95 4x4 did the same thing. A big part is winter fuel, but, I put in a K&N filter and did a vavle adjust, changed fuel filter and cleaned pre filter screen. Miles are back up.<br>
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