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I know there are a couple of threads out there regarding the Assassin pump from DTT, but I thought I would throw out my experience with the setup and the company.
I ordered an Assassin Pump from DTT several months ago and I knew it would take me a little while to receive as DTT informed me of a few changes taking place with the pump. All the same I was extremely anxious to get my hands on the pump. Being a common logic/mechanical thinker I felt the mechanical pump would be a great addition to my system for its simplicity and performance capabilities.
I received my pump and I was immediately impressed with the build quality of the pump itself. Nothing on this pump feels cheap, there is no free play in the tolerances of the pump gears, shaft. Really the only parts to potentially go bad are the two small shaft seals, which I believe could be locally sourced and replaced very easily. Did I mention the pump is anodized blue and is very appealing to look at even though no one really ever sees it, you will enjoy putting it on and looking at it.
On to the good stuff. As previously stated, I am a mechanical person, and I pretty much do everything to my rig on my own. This was no different. I ordered a complete kit as I don't have the time to source all the fittings and hose to do the job. I was placed on hold for a couple days as there was a fitting that I did not receive, however a quick phone call had one on the way immediately and I thank DTT for the prompt response to service. My actual total time of install was about 4-5 hours. I didnt work feverishly to complete the task as it was my first fuel system install and I wanted to understand the system and do it properly.
I began by mocking up the pump onto the oil pan. For those that would be concerned about knocking this pump off, forget about it, I would almost guarantee a higher chance of knocking off an airdog or fass than this. Especially in my case as I have a PSC steering brace on my truck, making it dang near impossible to hit the pump. The pump is simple to mount, and simple to adjust for belt deflection. Its a two piece mount system, with the pump being able to slide a small amount of distance to determine tension. The belt requires very little tension due in part to the massive cross lug design of the belt and pulleys. I carry a secondary belt in my truck but so far the current belt shows no signs of wear or slipping.
The installation of all the hose is kinda your own creation as you can choose what direction you wish to run it within the engine bay. The fittings all seem to be of high quality. All the same I used a permatex thread sealant that is not susceptible to deterioration due to contact with fuel. The worst part of the install is dropping the tank to install the draw straw system. The draw straw I received is the one from Vulcan installing back within the tank module. Pretty simple and very effective. I have been down to just below a quarter tank and haven't had any issues with running out of fuel, and I shouldn't as the straw is the exact same length as the factory straw setup.
The pieces for the module are nice cut pieces that fit well. Providing a larger 3/8 return line back to the tank in addition to the line already returning from the VP overflow. Simple and effective setup. Once I got it all installed, I prepared to fire up the truck. I removed the inlet pump hose, pressurized the tank and in a half second I was loosing gold out the inlet hose. Connected the inlet hose, removed the pump from the mount. (2 bolts), and cracked the lined at the filter housing. I placed a drill on the shaft and cranked it up, and again, fuel was almost immediately expelling from the line. Buttoned up the lines.
I cranked the truck for about 15-17 seconds and she fired right up. I immediately checked for leaks, I had one at the TEE but only took a brief second to lock down. No more leaks from anywhere else and so far none there after. I then began to check for proper pressures. At idle, the pump is pushing out 12-14 psi depending on cold or hot fuel. Upon touching the skinny pedal, PSI jumps to 19-20 instantly. Under WOT, pressure hangs tight at 20-21psi. So far I haven't had any issues with it maintaining pressure. My truck starts faster with this setup than it did with the factory pump. After I replaced my VP a month or so ago I had been having an occasional long crank session. Since the assassin install I haven't had a single start longer than 1 second.
I really like the fact that the pump increases pressure under throttle rather than losing pressure. I have not had any experience with the airdog, fass or raptor, but I know they lose rather than gain. The other thing I like is that even at idle, just blipping the throttle pushes it well above the needed 14 psi to cool the VP. During the winter, while the truck is high idling, it will also be above 14 psi, with no issues. I like the fact that there are no fuses to blow, its highly unlikely the gears are going to self destruct, and the belt can be replaced with only one wrench.
I intend to purchase a CAT filter kit from Vulcan here soon and install it, eliminating the stock housing kit, even though I haven't had any issues, I want to protect the pump from debris also, so I will pre-filter the fuel with the CAT system, (and its just plain better filtration).
I just thought I would share my experience with this pump and invite anyone looking to replace or upgrade their fuel system to give this pump a try. Any and all questions I had were promptly answered by DTT(Stefan). All in all I couldn't be happier with my purchase and the performance it has delivered.
I wanna try this kit when mine goes bad. Sounds like a good kit. Are you using the stock lift pump to prime the system when turning the key?
Thats negative on the stock pump. There is no need to prime: the system doesnt loose its prime unless there is a leak in the system. Its really no different than a normal system for starting. The truck obviously cant start until its cranked over and has fuel. The priming provides the fuel by building pressure ahead of time, this pump builds pressure the instant you turn the key to crank it over. As stated in the review, my trucks starts faster now than it did before with the factory pump, which by the way was not failing. It was only a year old, still produced good psi (for a stock pump).
I called them and threw down the credit card last week. I am so tired of the roller coaster pressures of my Raptor. I just hope it doesn't take months to get it, as I am taking the kids to Yellowstone the first of August. She said it would ship in about a week. Keeping my fingers crossed.
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