foundonroaddead
Registered User
Hi all,
I recently began working on my dad’s old 7.3 IDI in mid November since my LB7 Duramax has faulty injectors (again). It’s been sitting since 2008 so I’ve done a decent amount of maintenance on it so far. I’ve replaced batteries, return lines, injector orings, oil, transmission fluid, dumped the old gas, changed all the filters, new glow plugs and GP wiring, cleaned all the injectors, replaced lift pump with an electric Facet pump, new front and rear brakes and hardware, etc. Plan on replacing the alternator and water pump as well. Finally got it somewhat running about a week ago.
Anyways, my problem is something i’ve yet to see after searching at least 50 different forum posts. the truck will idle just fine, have had it idle an hour straight and no fuss, hovers around 650-750 RPM. When i floorboard it and let off it doesn’t die out either. (it used to, but seemed to stop after i got a new fuel filter and filled it with Diesel Kleen and let it sit a day.) However, as soon as i take it on the road, i drive roughly 1/2 - 3/4 miles down the road and it suddenly gets a power boost of sorts then completely kills out and comes to a stop. Then, i have to crank it for about 10 seconds before it finally starts back up again and i go about 500 feet then it dies once more. This makes it a PITA to get home even when it’s just a 1 minute drive away.
When it was originally parked a buddy of my dad’s said it was the injection pump going out. Can the IP manage to work just fine idling and then crap out when it’s put under load? my only other conclusion could be the facet lift pump simply cannot pull fuel through fast enough to supply the IP and thus kills out. meaning that the fuel tanks sending units may be clogged or faulty. my rear tank runs the engine fine (until the above happens) but even when in idle if i switch to the front tank my clear fuel tube from lift pump to filter fills with more air than fuel, rough idles, then dies after about 15 seconds. maybe fuel sitting in there for 12 years corroded or rotted the sending unit?
Had to start it so many times today that it killed the battery and i had to get a buddy pull it home with his car.
Would really like for this to not be the IP cause of how expensive it is...
Any help or advice is appreciated! Thanks.
I recently began working on my dad’s old 7.3 IDI in mid November since my LB7 Duramax has faulty injectors (again). It’s been sitting since 2008 so I’ve done a decent amount of maintenance on it so far. I’ve replaced batteries, return lines, injector orings, oil, transmission fluid, dumped the old gas, changed all the filters, new glow plugs and GP wiring, cleaned all the injectors, replaced lift pump with an electric Facet pump, new front and rear brakes and hardware, etc. Plan on replacing the alternator and water pump as well. Finally got it somewhat running about a week ago.
Anyways, my problem is something i’ve yet to see after searching at least 50 different forum posts. the truck will idle just fine, have had it idle an hour straight and no fuss, hovers around 650-750 RPM. When i floorboard it and let off it doesn’t die out either. (it used to, but seemed to stop after i got a new fuel filter and filled it with Diesel Kleen and let it sit a day.) However, as soon as i take it on the road, i drive roughly 1/2 - 3/4 miles down the road and it suddenly gets a power boost of sorts then completely kills out and comes to a stop. Then, i have to crank it for about 10 seconds before it finally starts back up again and i go about 500 feet then it dies once more. This makes it a PITA to get home even when it’s just a 1 minute drive away.
When it was originally parked a buddy of my dad’s said it was the injection pump going out. Can the IP manage to work just fine idling and then crap out when it’s put under load? my only other conclusion could be the facet lift pump simply cannot pull fuel through fast enough to supply the IP and thus kills out. meaning that the fuel tanks sending units may be clogged or faulty. my rear tank runs the engine fine (until the above happens) but even when in idle if i switch to the front tank my clear fuel tube from lift pump to filter fills with more air than fuel, rough idles, then dies after about 15 seconds. maybe fuel sitting in there for 12 years corroded or rotted the sending unit?
Had to start it so many times today that it killed the battery and i had to get a buddy pull it home with his car.
Would really like for this to not be the IP cause of how expensive it is...
Any help or advice is appreciated! Thanks.
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