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Author Topic: Fuel pump control module?  (Read 1383 times)

blackdog3

  • Single Axle Driver
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  • Posts: 5
Fuel pump control module?
« on: April 09, 2016, 10:15:53 AM »

Hey guys, i am a newbie to this site but not the the 3500HD's. I have had fuel issues with the truck for a year or more. The truck is a 98 3500HD with a 6.5. New parts that i installed, new front gas tanks with sending unit, new rear sending unit(letting water in the back tank), new front lift pump, new fuel filter and fresh fuel. The issues i have been having is that it runs out of fuel after about 120 -140 miles. I did a test after it ran it this past time, on the road I put 5 gallons of fuel in the front tank to get me to a station, got there put 10 gallons in the front tank and 12 in the back tank. Ran horrible at the station and ran out of fuel again twice sitting there, i filled the filter bowl up a few times, may have just lost prime? I believe both tanks are 16 gallons? So the issue is sometimes in transfers fuel and sometimes it does not. The rear lift pump works, we tested it but it seems slow. I am not sure how fast they are suppose to transfer. So this lead me to the fuel pump control module. Any thoughts, i know its long winded but i am trying to give as many details as to what I have done so far.
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1998 Chevy 3500HD 133,000 miles. newer 6.5 installed at 70k miles, newer injection pump, new pmd.

blackdog3

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  • Posts: 5
Re: Fuel pump control module?
« Reply #1 on: April 12, 2016, 09:35:36 PM »

I was just wondering does anyone have experience with the problems I am having?
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1998 Chevy 3500HD 133,000 miles. newer 6.5 installed at 70k miles, newer injection pump, new pmd.

ED-NY

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Re: Fuel pump control module?
« Reply #2 on: April 12, 2016, 10:54:52 PM »

Been monitoring your post...but everything I have is gas.
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blackdog3

  • Single Axle Driver
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  • Posts: 5
Re: Fuel pump control module?
« Reply #3 on: April 13, 2016, 07:11:27 AM »

Thanks for the response, i am sure somebody has a diesel! Its tough, these trucks are a dying breed i guess. I like to keep it on the road for a few more years.
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1998 Chevy 3500HD 133,000 miles. newer 6.5 installed at 70k miles, newer injection pump, new pmd.

cumminsguy

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  • Posts: 31
Re: Fuel pump control module?
« Reply #4 on: April 13, 2016, 09:16:55 AM »

Sending a pm. 
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AZTimT

  • One Ton Driver
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  • Posts: 61
  • K3500HD from when it wasn't just a sales gimmick!
Re: Fuel pump control module?
« Reply #5 on: April 14, 2016, 12:15:49 AM »

My over 200K diesel HD that was railroad owned has the automatic fuel transfer bypassed in favor of a manually controlled switch to transfer back to front at your leisure. Seems to work fine.

I've had twin saddle tank semi's run out of fuel with 1/4 tank in each side prior to sitting parked on a steep slant in rush hour traffic for 20+ minutes, so I am not a fan of automatic anything when it comes to multiple diesel fuel tanks. I plan on using a marine diesel selector valve like the Groco FV65038 when I put a 4bt with engine mounted lift pump into a 92-98 suburban with two tanks just so there are no electronics to fail. Simple still works as well as it always did. ;)
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94 K3500HD (factory Monroe 4wd upfit) short wheel base 9' bed 454 no more/NV4500HD/NP261HD/D70 frt/D80 rear 5.13's Cummins powered with 3.73's.
93 C3500HD long wheel base parts truck 14' bed 6.5(gone)/NV4500HD/D80 4.63
95 C3500HD medium wheel base 11' bed 6.5/4L80E/D80 4.63
2000 C3500HD Monroe extended cab 9' bed, 6.5/4l80E/D80HD 4.63 will become 4wd with D70 front and repowered some day...

ED-NY

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Re: Fuel pump control module?
« Reply #6 on: April 14, 2016, 07:42:58 AM »

Parting a 2002 Silverado dually (157" WB) with dual tanks. Pulled the gas 6.0/4L80E for another project. I have no idea how the gas fuel tank transfer system works..but would any of the system work on a diesel driveline. It has the side saddle and rear frame rail plastic tanks.
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GM Guy

  • 3500HD Driver
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  • Posts: 230
  • manual transmission 2wd enthusiast
Re: Fuel pump control module?
« Reply #7 on: April 22, 2016, 04:50:57 AM »

blackdog3,

What brand of lift pump did you put in?

The good news is that on a dual tank HD diesel, the transfer pump and the lift pump are interchangeable.

The lift pump is entirely seperate from anything to do with the transfer system, so while there may be issues there, ignore it for now till you get the LP going.

First off, being a 96+is good in the fact the LP control layout is much better than 95 and older.

When you turn the key, the lift pump should chatter away during the glow plug cycle. Use this time to open the bleed screw on top of the filter and see if you get diesel spurting out.

You can also put a water bottle up to the water drain "t-valve" up near the front of the engine and do a volume test. it should be gushing out at a good rate.

What brand of tanks and sending units did you use? I think some sending units come with a too restrictive sock on the end of the pickup tube. There is also differences between gas and diesel tanks, but the fact the sending unit fits means you likely got everything ordered correctly.
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