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Message: [QUOTE="Strictly Diesel, post: 95513, member: 1411"] I tell my customers that the answer here depends on what they are doing with the truck. The factory Bosch pumps are extremely reliable and have been known to run well over 200k miles. That's tough to beat. They problem with them is that they don't flow enough for bigger power setups. I've tried a number of pumps and as much as I've fought it due to the cost, I keep coming back to needing to build a dual stock Bosch fuel pump setup for my customers that need big power fuel flow with factory reliability. I love the Fuelab pumps we sell, and I recommend them all the time for guys who are working on a "toy". If your truck doensn't get driven daily, if you don't need to count on it for a long family road trip or in day to day bumper to bumper driving, they are a great pump. They are the most reliable aftermarket pump I've tested, hands down. That said, I can't tell you they will last 100k miles and I can't tell you that if you do break down in the middle of nowhere, it will be easy to find a bolt in replacement. If you are running a stock pump, you can get another stock pump (or even a parts store chinese copy of a stock pump) to directly replace it and get you moving in pretty short order. For me, the decision comes down to whether you want OEM level reliability or "race parts" reliability. ANY of the aftermarket pumps (Fuelab, Aeromotive, SX, etc) will be this way...they are much closer to being "race car parts" than they are to being OEM parts...so they will have "race car parts" reliability. Some people might get 100k miles out of one of those pumps, but I wouldn't stake my reputation on it and I certainly wouldn't tell a customer to expect it. With the stock Bosch pumps, if they are not starved for fuel or run at extremely high pressures, they will very likely give you OEM level reliability for 100k+ miles. For what it's worth, the Walbro pumps and the Bosch 044 pump that are commonly recommended are NOT rated for diesel fuel, are NOT covered under any warranty if used with diesel fuel...and therefore are not recommended (at least by me and their respective manufacturers) for use with diesel fuel. I've checked with Walbro on this same question several times, they don't have a diesel rated pump. Bosch is harder to check with, but they have specifically told me that the stock pump they produce for Ford is the only one they recommend for diesel fuel use. They DO NOT have any pumps that are rated for diesel fuel and have a higher flow rating. Take that for what it's worth, I personally won't sell a pump to a customer if the manufacturer won't stand behind it...I can't do that to my customers (which is why I stopped selling another product that has not been discussed yet in this thread). My only thoughts here are as follows... The Fuelab pump we sell flows about double the stock pump (at the low speed setting on the Fuelab). That was very intentional, we worked with Fuelab to specify that particular speed to get the flow where we wanted. At the reduced speed, the pump is relatively quiet, amp draw is reduced and it moves about 65-70gph at about 65psi. 2 stock pumps will be moving about that same amount of fuel at the same pressure. The difference, 2 stock pumps will be more reliable. Both of them are likely to run 100k miles plus, and if you do lose one pump...you've at least got the second one to get you off the road or even home if you turn the power down to where there is no pressure drop on one pump. I tested the cooler thing several years ago and found no significant evidence that it did a darn thing for these trucks. The fuel returning to the tank didn't lose significantly more heat through the cooler, and even running from full to empty without stopping and filling up and without a fuel cooler didn't produce any significant increase in fuel temperatures in the tank. I just looked and the articles I wrote about it are not published on my site anymore...I guess I need to figure out where those went, looks like they were lost in an upgrade. Hope that helps. [/QUOTE]