1998 12V Cummins Lift Pump problems - Dodge Cummins Diesel Forum
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Old 07-30-2009, 11:55 PM   #1 (permalink)
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1998 12V Cummins Lift Pump problems

Hey Fellas,
I have a '98 3/4 ton ext. cab 4wd 12v Cummins with 217,000 on it and have found out by a "cummins specialist" that the lift pump is bad and that the "fuel pre-heater" looks to be "sucking air" and recommended I bypass it. He said the "Delphi" lift pumps are not very good and would only last a couple of years, and a good one would cost about $250 or so. (He'd fix the lift pump problem for $550, parts and labor)...as I'm laid off that sounds high??? I also asked him if advancing the timing to 16* would gain me better power and MPG's...The answer was yes, but the price to do all of the above then went up to $1000....Is this guy pullin' my chain or not? What brand of lift pump should I replace mine with if the Delphi is not that great?

Basically I want to do all of the above as economically as I can due to being unemployed, but also want to do it right the first time,,,,Suggestions?????????

Matt Roberts
Chelsea,OK
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Old 07-31-2009, 12:00 AM   #2 (permalink)
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basically, your "mechanic" is full of s*it, the mechanical lift pumps are perfectly fine on the 12 valve, if you want to upgrade get an airdog or a fass pump, about the fuel heater, i've never heard of those sucking air, but i could be wrong im sure someone will answer your question better
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Old 07-31-2009, 12:16 AM   #3 (permalink)
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Yeah x2, dont talk to that guy anymore.. dont know how good you are with tools but putting on a lift pump isn't too bad at all, it is right under your fuel filter with 2 bolts into the side of the block, i just got trough pricing a new lift pump which runs 146 at vato zone, you may be able to use a 93 but im not sure if there's a difference but they are cheaper.. You could get a fass for less then what your mechanic wants to charge you lol
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Old 07-31-2009, 02:26 AM   #4 (permalink)
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what is the problem you are having? yes the fuel heaters are junk and can suck air and cause problems. maybe just bypass it, and then your lift pump will be working fine, then just send me the $500 lol
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Old 07-31-2009, 04:00 AM   #5 (permalink)
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Essentially, your mechanic is smoking crack. Bad crack.

New lift pumps can be easily found for $90, ditto to the fact that it's an easy replacement procedure, it took me about an hour which is probably longer than it should, but I removed the starter to make access easier.

Read this

http://www.cumminsforum.com/forum/94...m-writeup.html

and follow the steps for bypassing the fuel preheater, it's a good idea, they can suck air for sure. Also check all of your fuel lines for cracks around the ends, you could be having an air leak from there.

Don't talk to that guy anymore, he's gettin' over on you.
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Old 08-01-2009, 12:49 AM   #6 (permalink)
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another common problem is the screen in the lift pump gets clogged with trash. just simply remove it blow it off with carb cleaner and poke it back in there. its fixed 2 that we had the very same problem with
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Old 08-01-2009, 01:03 AM   #7 (permalink)
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Generally the lift pumps are strong and reliable, however they can have problems. The first and foremost thing you should do is install a fuel pressure gauge. That will tell you everything. Sometimes the "O" ring on the plunger can go bad. 10 cents at the hardware store will fix it. If you do have to remove the LP, replace the bolts with studs. You will never get it back on, especially if you are still using the fuel heater. If you remove the lift pump, make sure the internal rod does not drop into the engine. Major hassle if it does. The fuel heater can pull air, usually through the electric plug on the bottom. Smear a bunch of dielectric grease all over it. If the problem stops, you know the cause. The grease is a temporary fix. Concerning your mechanic, find another one.
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Old 08-01-2009, 11:23 AM   #8 (permalink)
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Quote:
Originally Posted by redneckcustoms13 View Post
another common problem is the screen in the lift pump gets clogged with trash. just simply remove it blow it off with carb cleaner and poke it back in there. its fixed 2 that we had the very same problem with
Think you must be talking about the screen in the fuel heater, there isn't one in the lift pump.

Go here> Fuel Pre-Filter Cleaning on Ram/Cummins
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Old 08-01-2009, 12:27 PM   #9 (permalink)
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yep, sorry i wasnt very clear with my instructions
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