Suffering bad MPG after HPFP...

Mk23 · 04-13-2009, 11:54 PM

So I got my HPFP replaced about a week ago and I notice that I am filling up a lot more frequently than I used to (with the same type of spirited driving) before I got the new HPFP. Does anyone know if there is a real possibility that a new HPFP could cause a decrease in MPG?

jayely1 · 04-13-2009, 11:56 PM

You got it a week ago and your filling up more then you use to be?? Do you fill up like 3 times a week or what?

freshwhite335 · 04-13-2009, 11:59 PM

maybe when they replaced the HPFP they re-set you adaptives and the car is just "re-learning" your driving style?

just a wild guess

Mk23 · 04-14-2009, 12:01 AM

Quote:

Originally Posted by jayely1

You got it a week ago and your filling up more then you use to be?? Do you fill up like 3 times a week or what?

I have filled up maybe once since it happened, and am now on a quarter tank...

ElliottP · 04-14-2009, 01:09 AM

the rest of the gas is probably leaking out on the road courtesy of your fuel pump! haha jk

E90330iS · 04-14-2009, 01:28 AM

maybe new part needs to get broken in

jmsent · 04-14-2009, 06:36 AM

Quote:

Originally Posted by Mk335i

I have filled up maybe once since it happened, and am now on a quarter tank...

Have you checked the odometer? Maybe you're just enjoying your newly repaired car a bit too much.

Potty_Pants · 04-14-2009, 07:01 AM

or the new one is working as designed...

possibly the old one wasnt pushing enough fuel , clogged, broken, etc and now your getting the full 100%

100% throttle + 70% fuel = 70% fuel.

and I know there have been threads regarding failing fuel pumps causing more gas consumption...

ppp

MSPORTWORLD · 04-14-2009, 08:18 AM

Quote:

Originally Posted by Potty_Pants

or the new one is working as designed...

possibly the old one wasnt pushing enough fuel , clogged, broken, etc and now your getting the full 100%

100% throttle + 70% fuel = 70% fuel.

and I know there have been threads regarding failing fuel pumps causing more gas consumption...

ppp

This answer sounds quite possible.

Mk23 · 04-14-2009, 03:30 PM

Quote:

Originally Posted by Potty_Pants

or the new one is working as designed...

possibly the old one wasnt pushing enough fuel , clogged, broken, etc and now your getting the full 100%

100% throttle + 70% fuel = 70% fuel.

and I know there have been threads regarding failing fuel pumps causing more gas consumption...

ppp

I hope it is just breaking in or something and not the above possibility...

My MPG is slightly lower, but not to the degree that I can show a tech and get them to replace it..

Lowcruzr · 04-14-2009, 03:39 PM

Maybe you should read this thread:
http://www.e90post.com/forums/showthread.php?t=250317

Mk23 · 04-15-2009, 01:03 AM

Quote:

Originally Posted by Lowcruzr

Maybe you should read this thread:
http://www.e90post.com/forums/showthread.php?t=250317

Appreciate it. I might get the techs to take a look at it if this keeps up. I'll also start to look for any leaks.

therealm3 · 04-15-2009, 12:10 PM

Funny, mine is doing the same. Lost about 2mpg and I drive the same as before. I figured it was because my old one was not delivering the correct amount of fuel, but the car ran fine before. I changed it cause it seemed like the right thing to do if BMW was offering.

galahad05 · 04-15-2009, 03:57 PM

Could be the gasoline. Winter/summer mixtures?

04-13-2009, 11:54 PM	#1
Mk23 Major 114 Rep 1,148 Posts Drives: 09 E92 Join Date: May 2008 Location: Central Florida iTrader: (0) Garage List 2009 335i Coupe [0.00]	Suffering bad MPG after HPFP... So I got my HPFP replaced about a week ago and I notice that I am filling up a lot more frequently than I used to (with the same type of spirited driving) before I got the new HPFP. Does anyone know if there is a real possibility that a new HPFP could cause a decrease in MPG? __________________ 09 - 335i E92 / Monaco Blue
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04-13-2009, 11:56 PM	#2
jayely1 Colonel 223 Rep 2,076 Posts Drives: 335i Join Date: Jun 2008 Location: New Mexico/Illinois iTrader: (1)	You got it a week ago and your filling up more then you use to be?? Do you fill up like 3 times a week or what?
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04-13-2009, 11:59 PM	#3
freshwhite335 Colonel 148 Rep 2,882 Posts Drives: 991/RR Sport AB Join Date: Aug 2008 Location: 904 FL iTrader: (6) Garage List 2011 BMW 135i [0.00]	maybe when they replaced the HPFP they re-set you adaptives and the car is just "re-learning" your driving style? just a wild guess __________________ 2014 Range Rover Sport Autobiography 2012.5 991 C2S 1978 Corvette
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04-14-2009, 01:09 AM	#5
ElliottP Private First Class 26 Rep 196 Posts Drives: 2008 E92 335i Join Date: Mar 2009 Location: Baltimore, MD iTrader: (0)	the rest of the gas is probably leaking out on the road courtesy of your fuel pump! haha jk __________________ My introduction: http://www.e90post.com/forums/showthread.php?t=246615 Stats: 2008 E92 335i \| Manual \| Style 230 19" wheels \| Black Sapphire Metallic \| Black Leather \| Gray Poplar \| I-Drive \| Cold Weather \| Premium \| iPod USB Mods: Dinan Stage II ECU \| 30% Tint \| Breyton 18" Race GTS winter setup \| Black Grilles \| Keyhole-less Driver's Door
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04-14-2009, 01:28 AM	#6
E90330iS Major General 143 Rep 6,333 Posts Drives: BMW M4 Join Date: Jan 2006 Location: Arcadia, California iTrader: (56) Garage List 2006 330i [0.00]	maybe new part needs to get broken in __________________ 2017 BMW M4 DCT Lease Transfer: https://f80.bimmerpost.com/forums/sh...8#post23736398
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04-14-2009, 07:01 AM	#8
Potty_Pants Colonel 66 Rep 2,189 Posts Drives: 2012 Genesis Sedan Rspec Join Date: Apr 2007 Location: Southern NJ iTrader: (0)	or the new one is working as designed... possibly the old one wasnt pushing enough fuel , clogged, broken, etc and now your getting the full 100% 100% throttle + 70% fuel = 70% fuel. and I know there have been threads regarding failing fuel pumps causing more gas consumption... ppp __________________ Olds Starfire > Chevy Malibu > Isuzu I-mark RS & Honda Magna 500 > Grand Am GT & YSR50 > Nissan Maxima & Ninja 750 > X-Wife > Hyundai Excel > Honda Prelude > Honda Accord > Honda Prelude & Ninja 250> Infiniti G35 > E90 335i > Hyundai Genesis Rspec, Hyunadai Sonata > Kia Sorento > Honda CRV-EX
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04-14-2009, 03:39 PM	#11
Lowcruzr Colonel 46 Rep 2,653 Posts Drives: '07 E92 335, '99 Civic Si, BUB Join Date: Feb 2009 Location: Rochester, NY iTrader: (1)	Maybe you should read this thread: http://www.e90post.com/forums/showthread.php?t=250317
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04-15-2009, 12:10 PM	#13
therealm3 Lieutenant Colonel 630 Rep 1,649 Posts Drives: F30 340 MSport Join Date: Aug 2006 Location: CA, USA iTrader: (7)	Funny, mine is doing the same. Lost about 2mpg and I drive the same as before. I figured it was because my old one was not delivering the correct amount of fuel, but the car ran fine before. I changed it cause it seemed like the right thing to do if BMW was offering.
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04-15-2009, 03:57 PM	#14
galahad05 Brigadier General 158 Rep 3,158 Posts Drives: '07 335i e90 Join Date: Mar 2008 Location: Long Island NY iTrader: (0)	Could be the gasoline. Winter/summer mixtures? __________________ Always do right. This will gratify some people and astonish the rest. --Mark Twain
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