MMO is said to be a good lubricant for fuel pumps. Since I just got through changing another GM in-tank fuel pump, and once again surviving the experience, I'd like my fuel pump to last as long as possible. Is MMO worthwhile for this purpose? How about TCW-3?
MMO and fuel pumps?
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Its not lubricating thats the issue with GM fuel pumps its cooling. As long as fuel if running through the pump it will be cooled. Run out of fuel and you are walking for gas and a new fuel pump.
If I did need a new fuel pump in a GM vehicle, I would get an OEM as its just too much hassle to change the fuel pump a second time.
I put 3 in my 1993 Suburban.
If I did need a new fuel pump in a GM vehicle, I would get an OEM as its just too much hassle to change the fuel pump a second time.
I put 3 in my 1993 Suburban.
Originally Posted By: Donald
Its not lubricating thats the issue with GM fuel pumps its cooling. As long as fuel if running through the pump it will be cooled. Run out of fuel and you are walking for gas and a new fuel pump.
^This.
I cringe when these college kids drive around their Pontiacs with the gas gauge on "E" because they think they're saving money holding off as long as possible to fill up (and even then some will only put a set amount of dollars in instead of the whole tank. So dumb and pointless)
Its not lubricating thats the issue with GM fuel pumps its cooling. As long as fuel if running through the pump it will be cooled. Run out of fuel and you are walking for gas and a new fuel pump.
^This.
I cringe when these college kids drive around their Pontiacs with the gas gauge on "E" because they think they're saving money holding off as long as possible to fill up (and even then some will only put a set amount of dollars in instead of the whole tank. So dumb and pointless)
Are GM pumps more prone to failure than others? I thought all in-tank pumps needed NOT to run dry.
If this isn't the case, perhaps it's the make and not the lack of, or usage of, MMO.....
If this isn't the case, perhaps it's the make and not the lack of, or usage of, MMO.....
My 2003 Dakota 3.9 fuel pump would quiet down as MMO was poured in gas tank. 20gal tank got 8ozs MMO.
in that same context:
I'd be very, very worried about those E85/flexfuel vehicles sold out there during the past several years with premature, if not frequent fuel pump failures, citing the lack of UCL and the likes in tank just to keep them running happily.
Q.
I'd be very, very worried about those E85/flexfuel vehicles sold out there during the past several years with premature, if not frequent fuel pump failures, citing the lack of UCL and the likes in tank just to keep them running happily.
Q.
All of the fuel pumps used by the car manufacturers are made by a small number of suppliers, so, the fuel pump used in a Tahoe could come from the same supplier (and might even be the same pump) as the fuel pump used in a Armada or Expedition. None of the car manufacturer's fuel pumps are immune to failure. As mentioned above, early fuel pump failures are typically due to cooling problems, the pump needs to be submerged in fuel to cool itself, so if you want to avoid a failure NEVER let the fuel tank get below 1/4 full. MMO or TCW3 mixed in the fuel might be helpful in preventing a fuel pump failure, but I don't think that there is any documented evidence that this is the case.
I've done a pump in a Firebird and in a Suburban. I've done several injectors in the Firebird and in a Cadillac STS. After the Suburban pump job I said there has to be a way to avoid this. I've been using Lucas UCL ever since (about 7-8 years) and I've not needed another pump or injector since. Is it proof that a UCL keeps pumps and injectors alive? Maybe not but I will keep using a UCL at about 2-3oz/10G since it seems like cheap insurance to me.
Except it's lack of fuel that kills the pump, and if the fuel is gone, so is anything you mixed in it... You may buy yourself an entire quarter of a second, but it is very, very rare for a person to catch a failing fuel pump while driving, and save the pump, in fact I don't know anyone who has.
As a fleet owner I say baloney to the idea that GM fuel pumps fail more than any others. They simply don't, at least in our V8 fleet pickups and vans. And our employees frequently run them well after the low fuel light is even on!
Tales of 2 and 3 or more replaced in one vehicle are just bad luck and not representative of the typical ownership experience.
Even in the Chrysler with TWO tanks the pump is in its own well in the bottom. It will still have adequate cooling even after the car stops running. No car I have ever seen in my lifetime ever uses all the fuel in its tank.
Tales of 2 and 3 or more replaced in one vehicle are just bad luck and not representative of the typical ownership experience.
Even in the Chrysler with TWO tanks the pump is in its own well in the bottom. It will still have adequate cooling even after the car stops running. No car I have ever seen in my lifetime ever uses all the fuel in its tank.
Running out of fuel the pump can access, & then Leaving the ignition on waiting for a tow truck not realizing their fuel pump is running with no fuel pumping through is what I was told can kill a pump. It will shut off once the pressure is meet but with no fuel it can't build that pressure. Another is sitting a long time like 2 yrs without running. They may run but usually die withen 6 mos. just what I have seen.
Probably most of the fuel pumps Bosch OEM carter etc.. Some may be made by same company but no always to same specs.
Then you probably have the imported aftermarket ones on top of that. Some beeter some worse? You can also pay $400 or $125 for the same pump & I have seen both run til the person sold it, I understan most don't wanna risk replacing anytime soon.
Then you probably have the imported aftermarket ones on top of that. Some beeter some worse? You can also pay $400 or $125 for the same pump & I have seen both run til the person sold it, I understan most don't wanna risk replacing anytime soon.
Originally Posted By: SteveSRT8
As a fleet owner I say baloney to the idea that GM fuel pumps fail more than any others. They simply don't, at least in our V8 fleet pickups and vans. And our employees frequently run them well after the low fuel light is even on!
Tales of 2 and 3 or more replaced in one vehicle are just bad luck and not representative of the typical ownership experience.
Even in the Chrysler with TWO tanks the pump is in its own well in the bottom. It will still have adequate cooling even after the car stops running. No car I have ever seen in my lifetime ever uses all the fuel in its tank.
I guess I'm one of the unlucky ones. I've replaced several in my wife's Astro vans, and now one in my GMC Savana. Autozone used to sell them with a lifetime warranty, but I guess they realized that wasn't a good idea. Now they're 1 year.
As a fleet owner I say baloney to the idea that GM fuel pumps fail more than any others. They simply don't, at least in our V8 fleet pickups and vans. And our employees frequently run them well after the low fuel light is even on!
Tales of 2 and 3 or more replaced in one vehicle are just bad luck and not representative of the typical ownership experience.
Even in the Chrysler with TWO tanks the pump is in its own well in the bottom. It will still have adequate cooling even after the car stops running. No car I have ever seen in my lifetime ever uses all the fuel in its tank.
I guess I'm one of the unlucky ones. I've replaced several in my wife's Astro vans, and now one in my GMC Savana. Autozone used to sell them with a lifetime warranty, but I guess they realized that wasn't a good idea. Now they're 1 year.
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