Diesel Fuel Injection Pump
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Joined: Sep 2008
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Diesel Fuel Injection Pump
Greetings and thanks for the replies. I have a 1991 f-350. 7.3 diesel. I recently repaired a leaking fuel line by cutting out the bad section and splicing in a section of hose. I also replaced the fuel return line hoses on top of the intake. Since I did all of this I've had difficulty starting the truck. I thought it might be because of air in the system. It does start but with difficulty. I took it to a repair shop and they tell me they want to change the "Diesel fuel injection pump ". A $600.00 part plus 10 hours labor. This truck had no prior history of starting difficulty before I opened the fuel lines. Could this have caused that pump to go bad, or could they be mistaken? If that pump is bad wouldn''t the truck not start at all? What are some other symptoms of a bad Diesel fuel injection pump? This is an expensive decision. Any advice is much appreciated.Thanks
More Turbo
Joined: May 2008
Posts: 548
Likes: 3
From: Beaufort, SC
It sure sounds like air is getting in through your return lines, not like you have a bad IP. The most common symptom of an IP going bad, is hard starts while the engine is warm.
You should check all your hose connections on the return lines. Does the vehicle start fine after it's been warmed up, then shut-off for an hour or so?
Gary
You should check all your hose connections on the return lines. Does the vehicle start fine after it's been warmed up, then shut-off for an hour or so?
Gary
Laughing Gas
Joined: Jun 2007
Posts: 1,106
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From: Virginia
No prior problems until after you opened the lines up sounds like air to me as well. I would agree with EMD_DRIVER. Check the return lines, and check that spliced rubber hose that you installed.
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Hey Guys, Thanks for the reply. The truck seems to run fine after it is finally started. Once it warms up it seems easier to start, not harder. I did notice also that a few of the plastic end cap T's on the return lines are leaking. That was one of the issues I wanted the repair shop to address. My initial thought was that must be contributing to the problem, but they said because the leaking was in the return line part of the system that it shouldn't affect the vehicle starting. I think they may be mistaken. Anyway I'm going to hold off on having that injection pump put in, and have the return line issues delt with first. Thanks again.
Laughing Gas
Joined: Jun 2007
Posts: 1,106
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From: Virginia
Hey Guys, Thanks for the reply. The truck seems to run fine after it is finally started. Once it warms up it seems easier to start, not harder. I did notice also that a few of the plastic end cap T's on the return lines are leaking. That was one of the issues I wanted the repair shop to address. My initial thought was that must be contributing to the problem, but they said because the leaking was in the return line part of the system that it shouldn't affect the vehicle starting. I think they may be mistaken. Anyway I'm going to hold off on having that injection pump put in, and have the return line issues dealt with first. Thanks again.
Its never good to give advice without seeing/testing the vehicle, but I would reevaluate your diesel mechanics choices and maybe find someone else to help you in the future.
Senior User
Joined: Jul 2007
Posts: 118
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From: Winthrop, Minnesota
Return line kit
Whenever you replace the return lines you should also replace the orings under the plastic return tees on the injectors. As you have found out the hard way, the orings become hard from the heat of the engine and will not be able to seal properly after being disturbed during replacing the return lines. You can get a complete return line kit here for $30. Hectorwithinjectors
Elder User
Joined: Jan 2008
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From: Guymon
10 HOURS TO REPLACE AN IP!!!!! THAT CRAZY AND YOUD BE GETTING RIPPED OFF ON LABOR....AND THEY KNOW IT!!!!
I also agree with the others, that don't sound like an ip problem to me. I think your on the right path fixing small fuel leaks and making the system air tight. Back to the IP, I can probably change my IP on my truck in around 2 hours. Its very easy. At work where we don't have turbos, I bet I could get one done in an hour. They are very easy to replace. Don't let that shop SCREW you. Flat rate aint even close to 10 hours for that pump in the book... If you still have problems after fixing your leakS, your lift pump could be letting fuel drain back down as well. If ALL ELSE FAILS, I would try to replace it. Its cheap and easy. Just my opionion. good luck.
I also agree with the others, that don't sound like an ip problem to me. I think your on the right path fixing small fuel leaks and making the system air tight. Back to the IP, I can probably change my IP on my truck in around 2 hours. Its very easy. At work where we don't have turbos, I bet I could get one done in an hour. They are very easy to replace. Don't let that shop SCREW you. Flat rate aint even close to 10 hours for that pump in the book... If you still have problems after fixing your leakS, your lift pump could be letting fuel drain back down as well. If ALL ELSE FAILS, I would try to replace it. Its cheap and easy. Just my opionion. good luck.
