terrible fuel mileage - Ford Powerstroke Diesel Forum

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post #1 of 15 Old 03-08-2012, 07:14 AM Thread Starter
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terrible fuel mileage

I have gotten about 45-50 miles to a quarter tank. And I am driving like a grandpa, never gunning it and never getting the rpms past 2000-2100. And its city driving.what do tall think? Tell me everything yall may think.

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post #2 of 15 Old 03-08-2012, 07:24 AM
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what tune you running?


2000 DRW CC 7.3
Exterior: 08 Exterior Clone, 22.5's
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post #3 of 15 Old 03-08-2012, 07:27 AM
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Quote:
Originally Posted by 7.3'00 View Post
I have gotten about 45-50 miles to a quarter tank. And I am driving like a grandpa, never gunning it and never getting the rpms past 2000-2100. And its city driving.what do tall think? Tell me everything yall may think.

Thanks Austin
Those numbers mean absolutely nothing.

Fill it up all the way. Best way is to take your time, and fill to the neck. (Not when foam shuts the pump off, but when you can see fuel in the neck.)

Drive 100-200 miles.

Fill up the same way again.

Divide the miles by the gallons filled.

THAT is your mileage.
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post #4 of 15 Old 03-08-2012, 07:32 AM
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I was gonna say that but, something still sounds off 45 miles to a quarter tank is really low, that would only be 180 to a tank, something is off.


2000 DRW CC 7.3
Exterior: 08 Exterior Clone, 22.5's
Engine Mods: GTP38R WW2, 5 inch exhaust,T500, 6637, TW tunes,DI Up pipes, 6.7 fuel pump fuel system.
Trans Mods: 6.0 trans cooler, JW Valve body,Billet triple disc converter.
Sound Mods: 7" flip out tv, 3-way speakers all around, 12" sub, 500 watt amp.
Misc:dieselsite coolant filter, max ac assist, BRV, IHD,gauges, CCV

Next up power rear window
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post #5 of 15 Old 03-08-2012, 07:35 AM
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Originally Posted by campbellflage View Post
I was gonna say that but, something still sounds off 45 miles to a quarter tank is really low, that would only be 180 to a tank, something is off.

Here's my reasoning:

If I fill up till the pump clicks off.... my gauges is at 3/4 full at around 65-75 miles.

If I fill up all the way...(to the neck) it won't even start coming off the full line until 100-120 miles.

Either way, basing "poor mileage" off your fuel gauge is not a good idea. Those things are about as accurate as Gitmo closing date(s).
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post #6 of 15 Old 03-08-2012, 07:38 AM
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Quote:
Originally Posted by ToMang07 View Post

Here's my reasoning:

If I fill up till the pump clicks off.... my gauges is at 3/4 full at around 65-75 miles.

If I fill up all the way...(to the neck) it won't even start coming off the full line until 100-120 miles.

Either way, basing "poor mileage" off your fuel gauge is not a good idea. Those things are about as accurate as Gitmo closing date(s).
I agree, especially the last quarter in my tank is way off, I have ran outta fuel still registering 1/8 of a tank(probably holes in my pickup tube)


2000 DRW CC 7.3
Exterior: 08 Exterior Clone, 22.5's
Engine Mods: GTP38R WW2, 5 inch exhaust,T500, 6637, TW tunes,DI Up pipes, 6.7 fuel pump fuel system.
Trans Mods: 6.0 trans cooler, JW Valve body,Billet triple disc converter.
Sound Mods: 7" flip out tv, 3-way speakers all around, 12" sub, 500 watt amp.
Misc:dieselsite coolant filter, max ac assist, BRV, IHD,gauges, CCV

Next up power rear window
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post #7 of 15 Old 03-08-2012, 07:53 AM
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My mileage started slipping (hand calculated) and I looked under the fuel bowl just on a whim and there was a puddle under it in the valley (also was running down the back of the motor and I thought I had a pedestal oil leak) Anyway it is common for the drain valve on the back of the bowl to leak badly after this long. (11yrs on mine). I am not saying you can lose 50% of your mileage this way, but may want to start looking for fuel taking a hike on you. I got everything I needed from Bob at Diesel O Rings.com

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Dave

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Last edited by EasyRhin0; 03-08-2012 at 07:54 AM. Reason: added content
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post #8 of 15 Old 03-08-2012, 08:07 AM
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Stop parking on an incline. That will throw off the gauge every time and induce mileage heart attacks.


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My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.
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post #9 of 15 Old 03-08-2012, 09:53 AM
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Originally Posted by audiocontr View Post
Stop parking on an incline. That will throw off the gauge every time and induce mileage heart attacks.

oh so true...
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post #10 of 15 Old 03-08-2012, 04:03 PM
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glad yall said something about parking on a incline. with over a quarter tank and parked down hill mine shows less than empty. whats the cause.
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