Symptoms of a bad lift pump?

Jetto Funk · 07-22-2008, 10:51 PM

Hi all, have a 98 12v w/260k on the clock.
I just spent the last 6 hrs putting home from 3 cities away. My trucks been acting a bit funky lately, power has been weak and air has been getting in the fuel filter. I run heated fuel lines and today I put in some veggie oil, not the first time but after a few miles the truck decided it didn't want to play anymore. My fuel filter went completely dry, if I idled it long enough upside down with the bleed openit would fill back up, I'm using a clear goldenrod btw. But I noticed that when I put my finger on the bleed and opening it up after it had emptied that there was a vacuum on it and not pressure. I changed out the whole filter and put in a inline.
I'm not sure what's up with it, but it idles somewhat decent but bogs when it runs and fills up with air. Checked all the lines can't find a leak.
Any ideas? and does anyone have a list of symptoms to a bad mechanical lift pump?
Thanks

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Dad · 07-23-2008, 04:15 AM

Bump......

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High Rider: 98.5 Ram 2500 4x4, 5 Spd, SB 13", A3000 turbo, DDP Stage 3 sticks, studded, 4" TB,, AEM Intake, Gauges, FASS95, S-Chips Tune
Low Rider: '06 Chevy 1/2 Ton, Victory Red, 2/4 Drop, roll pan, sport mirrors, rollin on 20's

Joe G. · 07-23-2008, 05:36 AM

That sounds like a fuel heater failure. Might be some other air leak. Look here: Joe G's fuel system writeup

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KDP tab fix info and fuel system article jgeorge1@suddenlink.net '95 2500 CC auto 4X4,3.54,Combo EGT/boost guage,PacBrake,TST #5,370 injectors,DTT TC/VB, Cummins chrome kit.

Jetto Funk · 07-23-2008, 08:31 AM

I was thinking the fuel heater may be an issue as far as air went but what about the occasional vacuum on the filter?

I'm gonna read through that post, thanks Joe.

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Email shaneyost@gmail.com
Vancouver, Washington
U.S Army Combat Engineers
I'll never forget...

Jetto Funk · 07-23-2008, 08:32 AM

btw I run a heat exchanger on my fuel/coolant to heat before hitting the fuel filter.
Thanks and sorry about my original post, was very tired after a long long day.

__________________

Email shaneyost@gmail.com
Vancouver, Washington
U.S Army Combat Engineers
I'll never forget...

Jetto Funk · 07-23-2008, 12:24 PM

So I removed the fuel heater and cleaned the pre filter, holy crap that pre filter was dirty!
Seriously I'm surprised i had any flow at all, it was caked. Lucky me I live in sunny florida where it rains as soon as you start to work on something. So I gotta finish plumbing the fuel lines after the rains stops and I'll let you guys know how it goes from there.

__________________

Email shaneyost@gmail.com
Vancouver, Washington
U.S Army Combat Engineers
I'll never forget...

**2Tone12V** · 07-23-2008, 12:59 PM

Hope all goes well. Sounds like Missouri this year. If you want it to rain in missouri this year, SCHEDULE A TRUCK PULL!

__________________
Anthony
PureFlow Technologies Inc.
Tech Support-High Performance Division

Jetto Funk · 07-23-2008, 04:02 PM

Well it stopped raining for 5 minutes, just long enough to get everything together and it runs great! Still a little low on power but I'm not complaining. Thanks Joe, your guide was a huge help.

__________________

Email shaneyost@gmail.com
Vancouver, Washington
U.S Army Combat Engineers
I'll never forget...

07-22-2008, 10:51 PM	#1 (permalink)
Jetto Funk Newbie Join Date: Nov 2006 Posts: 22 Jetto Funk's Truck Pics	Symptoms of a bad lift pump? Hi all, have a 98 12v w/260k on the clock. I just spent the last 6 hrs putting home from 3 cities away. My trucks been acting a bit funky lately, power has been weak and air has been getting in the fuel filter. I run heated fuel lines and today I put in some veggie oil, not the first time but after a few miles the truck decided it didn't want to play anymore. My fuel filter went completely dry, if I idled it long enough upside down with the bleed openit would fill back up, I'm using a clear goldenrod btw. But I noticed that when I put my finger on the bleed and opening it up after it had emptied that there was a vacuum on it and not pressure. I changed out the whole filter and put in a inline. I'm not sure what's up with it, but it idles somewhat decent but bogs when it runs and fills up with air. Checked all the lines can't find a leak. Any ideas? and does anyone have a list of symptoms to a bad mechanical lift pump? Thanks __________________ Email shaneyost@gmail.com Vancouver, Washington U.S Army Combat Engineers I'll never forget...

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07-23-2008, 04:15 AM	#2 (permalink)
Dad Administrator Join Date: May 2007 Location: Indiana Posts: 3,871 Dad's Truck Pics	Bump...... __________________ High Rider: 98.5 Ram 2500 4x4, 5 Spd, SB 13", A3000 turbo, DDP Stage 3 sticks, studded, 4" TB,, AEM Intake, Gauges, FASS95, S-Chips Tune Low Rider: '06 Chevy 1/2 Ton, Victory Red, 2/4 Drop, roll pan, sport mirrors, rollin on 20's

07-23-2008, 05:36 AM	#3 (permalink)
Joe G. Diesel Freak Join Date: Apr 2007 Location: Eureka, CA Posts: 702 Joe G.'s Truck Pics	That sounds like a fuel heater failure. Might be some other air leak. Look here: Joe G's fuel system writeup __________________ KDP tab fix info and fuel system article jgeorge1@suddenlink.net '95 2500 CC auto 4X4,3.54,Combo EGT/boost guage,PacBrake,TST #5,370 injectors,DTT TC/VB, Cummins chrome kit.

07-23-2008, 08:31 AM	#4 (permalink)
Jetto Funk Newbie Join Date: Nov 2006 Posts: 22 Jetto Funk's Truck Pics	I was thinking the fuel heater may be an issue as far as air went but what about the occasional vacuum on the filter? I'm gonna read through that post, thanks Joe. __________________ Email shaneyost@gmail.com Vancouver, Washington U.S Army Combat Engineers I'll never forget...

07-23-2008, 08:32 AM	#5 (permalink)
Jetto Funk Newbie Join Date: Nov 2006 Posts: 22 Jetto Funk's Truck Pics	btw I run a heat exchanger on my fuel/coolant to heat before hitting the fuel filter. Thanks and sorry about my original post, was very tired after a long long day. __________________ Email shaneyost@gmail.com Vancouver, Washington U.S Army Combat Engineers I'll never forget...

07-23-2008, 12:24 PM	#6 (permalink)
Jetto Funk Newbie Join Date: Nov 2006 Posts: 22 Jetto Funk's Truck Pics	So I removed the fuel heater and cleaned the pre filter, holy crap that pre filter was dirty! Seriously I'm surprised i had any flow at all, it was caked. Lucky me I live in sunny florida where it rains as soon as you start to work on something. So I gotta finish plumbing the fuel lines after the rains stops and I'll let you guys know how it goes from there. __________________ Email shaneyost@gmail.com Vancouver, Washington U.S Army Combat Engineers I'll never forget...

07-23-2008, 12:59 PM	#7 (permalink)
2Tone12V PureFlow Technologies Inc Join Date: Jun 2008 Posts: 110 2Tone12V's Truck Pics	Hope all goes well. Sounds like Missouri this year. If you want it to rain in missouri this year, SCHEDULE A TRUCK PULL! __________________ Anthony PureFlow Technologies Inc. Tech Support-High Performance Division

07-23-2008, 04:02 PM	#8 (permalink)
Jetto Funk Newbie Join Date: Nov 2006 Posts: 22 Jetto Funk's Truck Pics	Well it stopped raining for 5 minutes, just long enough to get everything together and it runs great! Still a little low on power but I'm not complaining. Thanks Joe, your guide was a huge help. __________________ Email shaneyost@gmail.com Vancouver, Washington U.S Army Combat Engineers I'll never forget...