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Bad Fuel Pump and Injector Pump?

22734 Views 25 Replies 8 Participants Last post by  colz04.5
OK, guys... first post, so my apologies if this duplicates and existing one...

Think I lost my fuel pump yesterday, home too late to really investigate. Would rather do the work myself than pay a dealer anything. Feel comfortable w/ it after reading other threads on here and having a repair manual to do it.

BUT, talking to dealerships about parts, guy mentions that many times when you lose the fuel pump, it'll also kill the injector pump. Any feedback on this? Feels a bit like he's telling me to expect more than a kiss at the end of our date... y'all have helped me diagnose a bunch of other troubles, so I appreciate any feedback.

Truck is stock, in tank conversion is already done, to my knowledge. Will be confirming this tonight. Also, changing the fuel filter tomorrow before breaking off the big work.
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Discussion Starter · #3 ·
Left work yesterday, drove about a mile, took off from stop light to about 45 MPH, engine stuttered then shut down while moving. Coasted to stop, tried to restart, caught and then shuttered off after 2-3 seconds. Drained the separator, primed and tried again, caught and died. Drained separator again, no dice this time. Cranks, good power to guages/lights, won't catch. Replaced h20 pump, tensioner pulley and belt in last few weeks, all look good. I'm open to other suggestions, but sure seems like fuel delivery to me.
 

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Varify the in tank conversion, if that is not done, I would lean towards the lift pump failing.

To my knowledge, I've not seen a failed lift pump cause CP3 failure.



 

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how many hours/miles on fuel filter?

any water in the fuel you drained from the separator?

pull filter and look for any water in bottom of cannister

r:agree2: with BBRam on the FF and CP3

run a lift pump volume test at the line into the CP3
tap key to lock LP on for 30 seconds
minimum 1/2 qt in 10 secs, easy roadside test.:thumbsup:
 

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Discussion Starter · #6 ·
Thanks for the info/confirmation. More evidence of why I don't like dealers, especially out here where diesels are an afterthought.

Filter is WAY too old, promise. I've never changed it, so if it doesn't have at least 120k on it, I'd be shocked. Got one on order at Grainger, changing tomorrow and then will run the pump test. If failure there, looks like I'm dropping the tank on Saturday.

Any thoughts on the lift pumps from autozone/napa vs. from Dodge? Decent price difference, don't want to let that translate into shorter life. Need this to last until I can grab a FASS for the truck.
 

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:doh::banghead::spank:
hope you haven't damaged your Bosch HPCR fuel injection system with no filter changes?

hunt up your local Cummins authorized dealer,most stock parts for the 5.9 ISB and carry the best fuel filter for our cannister filters, put on one of these until you get a 2 micron on it.
Baldwin PF7977 5 micron
Cummins Inc. Homepage

get your oil filters there also, Cummins Stratapore, top line no fail filter

they're also avail. at many of our site's sponsors such as Geno's

go to Cummins dealer for all your engine OEM parts, half the price of Dodge

good luck with the engine:thumbsup:

Thanks for the info/confirmation. More evidence of why I don't like dealers, especially out here where diesels are an afterthought.

Filter is WAY too old, promise. I've never changed it, so if it doesn't have at least 120k on it, I'd be shocked. Got one on order at Grainger, changing tomorrow and then will run the pump test. If failure there, looks like I'm dropping the tank on Saturday.

Any thoughts on the lift pumps from autozone/napa vs. from Dodge? Decent price difference, don't want to let that translate into shorter life. Need this to last until I can grab a FASS for the truck.
 

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Discussion Starter · #9 ·
Changing the filter to a Baldwin PF7977 tomorrow after a swing by Grainger, gonna try the lift pump test tonight. Thanks for the heads up on the Cummins dealership vs. Dodge...
 

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Discussion Starter · #10 ·
OK, still waiting on the filter. Check, and can confirm that the fuel/lifter pump is canister mounted. Thinking I can get this from Cummins. Other than what seems like more regular failures, any major reason to pay for a conversion now?

I've also bumped the engine to start the pump, no sound whatsoever. So, gonna change the filter and pump, pray no other damage... will definitely be better on filter changes from here on...
 

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sounds like the OEM style lift pump has failed, they're weak and a poor short lived design. the plugged FF probably overworked the poor thing.
go with an inline
last far longer, easy to service
don't do the intank from Dodge, expensive and a pain/expensive to service
 

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Discussion Starter · #12 ·
Steel/Ram, any suggestions on inline replacements? NAPA has one that matches the Carter PN referenced in other LP threads. Is there a better short term option until I can get a FASS? Or, by inline, do you mean FASS, Steel? Thanks to you both!
 

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Here's something too, install a fuel pressure gauge in the cab. The owner before me had the stock pump go bad and left him stranded so he added the gauge. Now you can tell any time your pump is not performing like it should. I need to throw my fass in mine to fix the stock pump weak link. The stock pumps really suck mine only runs 4-5psi all the time
 

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Discussion Starter · #15 ·
So, here's the decision for today, as time and funds are in short supply... gonna go w/ an aftermarket/Carter in-line LP replacement, filter mounted, and the new filter. Also, gonna put an inline filter in as a 'screen' in front of the LP, to help keep it from getting clogged (found on another post). Then, assuming she cranks right up and asks to get to work, I'll start saving for the aftermarket FASS/AirDog upgrade.
 

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ya don't you hate how money is always the limiting factor when it come to fixing your truck
 

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:thumbsup: guy's got to do what he has to do in these hard times. most of us don't have money to burn. it's just a truck and we all need transportation.
that Carter may last longer than the Cummins 300k miles and I know longer than the seats in the Dodge, bad from the factory.

make sure your pre pump add on filter flows at least 50 gph to prevent fuel starvation for stock engine

good luck at the job and you drive the best PU engine on the road, Cummins
don't ya just love the sound of the beast when ya mash the go pedal on a hard pull and see that ***** Stroke disappear in the black smoke


So, here's the decision for today, as time and funds are in short supply... gonna go w/ an aftermarket/Carter in-line LP replacement, filter mounted, and the new filter. Also, gonna put an inline filter in as a 'screen' in front of the LP, to help keep it from getting clogged (found on another post). Then, assuming she cranks right up and asks to get to work, I'll start saving for the aftermarket FASS/AirDog upgrade.
 

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Discussion Starter · #19 ·
So, NAPA called w/ the LP today, took the afternoon off to come home and get dirty... swapped old for new in under an hour, including installing the pre-pump filter and having to rob the stock pump for the 'quick-connect' fitting as the one in the kit didn't work... After a quick prayer, primed the pump and cranked the baby right up! Nothing like hearing that big engine purr and ask to get going!

Steel, you are spot on with the seats - possibly the worst part of the truck.
 

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hope you layed in a supply of the Baldwin PF7977 FF, carry a spare. never know when a station is going to have a dirty dump of fuel.

get a 2 micron fuel filter/water separator on when funds allow.
far cheaper than injectors and an engine.
i have seen cases of these Cummins HPCR going 300,000 miles on the original injectors running top quality 2 micron fuel/water filtering.

i use those space age memory foam seat back pads on mine
saves the hemorrhoids on long trips.
i don't do hemorrhoid pictures so you're going to have to settle for this:spank:



 
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