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STS 7004 OPT-AWD -- Automatic Water Drain System for STS 7004

Your Price: $2499.00 Product

STS7004 4 GPM

Your Price: $13769.00 Product

Automatic Water Drain for STS 7004

Your Price: $2499.00

STS 7004 4 GPM
Programmable Automated Fuel Filtration Systems

Ensures Safe & Reliable Emergency Generator Operation

STS 7004 4-GPM Programmable Automated Systems

Click on Graphic to Enlarge

STS 7004 4 GPM
Programmable Automated
Fuel Filtration Systems


STS 7004

Flow Rates

4 GPM / 240 GPH
(15.1 LPM / 908 LPH)

Port Size

In 3/4" NPT
Out 3/4" NPT


1/3 HP single phase, continuous duty, thermally protected, TEFC


110V/60Hz/15A or


Spur Gear Positive Displacement Pump w/Automatic Thermal Overload Protection

Maximum Fluid Viscosity

5 cSt


Stainless Steel

Smart Filtration

TSC-7000 Controller with Touch Screen and remote monitoring, Modbus, TCP/IP LAN and Internet Connectivity

LG-X Model

LG-X 1500

Primary Filter/Water Separator

SWK 2000/18 with Drain Valve & Analog Vacuum Gauge & Switch

Primary Filter Elements

10 or 30 µ Fine Filter
3 or 10 &Micro; Water Block

Secondary Filter

Single Spin-on Element

Secondary Filter Elements

1, 3, 10, or 25 µ Fine Filter
& 3 or 10 µ Water Block

Weatherproof Cabinet

NEMA 12 (IP55), 13 (IP65), 4 (IP66), & 4X (IP66) Powder Coat (Standard) or Stainless (Optional)

Operating Temperature

41 - 104 deg. F
(5 - 40 deg. C)


+/-305 lbs (138.3 kg)

Dimensions (HxWxD)

36" x 36" x 12"
(91 x 91 x 30 cm)

Not for use with fluids that have a
flash point below 100 deg. F.

Available Options

Replacement Filter Options
STS 7004 - 4 GPM

Use the below links to
determine pricing or
for ordering replacement filters

Primary Separ SWK 2000/18

  • #01810 10-Micron Filter

  • #01830 30-Micron Filter (Standard)

  • #01860S 60-Micron Mesh Stainless Steel Screen

Secondary Spin-on Filter

  • FF-1 1-Micron B100 & All Bio

  • FF-3 3-Micron

  • WB-3 3-Micron Water Block (Standard)

  • FF-10 10-Micron

  • WB-10 10-Micron Water Block

  • FF-25 25-Micron

  • FFZ-3 X-Glass 3-Micron Absolute

STS 7004-4GPM Literature

STS 7004 4-GPM Programmable Automated Systems

Click on Graphic to Enlarge

1) Fuel Inlet (From Tank)

11) Motor

2) Inlet Ball Valve

12) ALGAE-X Magnetic
Fuel Conditioner

3) Separ Primary
Filter/Water Separator

13) Secondary Filter

4) Vacuum Gauge

14) Pressure Switch

5) Drain Valve
(push and turn open)

15) Pressure Gauge

6) Man. Air Vent/Bleed

16) Outlet Ball Valve

7) Vacuum Switch

17) Fuel Outlet (To Tank)

8) TSC-7000 Touch
Screen Controller

18) Mechanical Flow
Meter with Flow Switch

9) Pressure Relief Valve

19) Leak Detector (Float
Switch) in Spill Tray

10) Gear Pump


STS 7004 Above Ground
Tank Installation Graphic

STS 7004 Above Ground Tank Installation Graphic

Click on Graphic to Enlarge

STS 7000 Series Advanced Functionality

The STS 7000 Series of Programmable Automated Fuel Filtration Systems are self-contained, stand-alone filtration, separation and conditioning systems that are purpose focused to remove and prevent the buildup of water, sludge and contaminants in tanks, eliminating and preventing microbial contamination, and are a critically important part of a Fuel Management Program. Periodic operation of the Fuel Filtration System according to a Fuel Management Program will stabilize diesel and bio-fuels, eliminate microbial contamination and optimize and maintain fuel quality. Off-the-shelf systems are available with the capacity and features for the configuration and design of your facilities needs and requirements based on tank location, size, number, and ultimate needs of the customer.

All STS Systems feature:

  • Multi-stage water removal and particulate filtration

  • NEMA 12, 13, 4, 4X Powder Coated (Standard) or Stainless (Optional) Enclosure

  • UL508A Smart Filtration Controller

  • Continuous-Duty Pump, Viton Seals

  • Stainless Steel Plumbing

  • Stand-Alone, Reliable & Turn-Key Operations

All STS 7000 Series Systems feature:

  • Maintenance Alert Log File

  • Runtime Totalizer

  • Alarm History

  • On-Screen Help

  • Automatic Alerts

  • Leak Detection

  • Water Detection

  • High Pump Vacuum Detection

  • High Pump Pressure Detection

  • Low Fuel Flow Alert

  • Pump Shutdown when Filters Require Service

  • Emergency Stop

Optional Features Available on Select Models Include:

Which STS 7000 Series System is right for your application is dependent on the nature of your application. The characteristics of the STS 7004 is shown in the table to the left.

Fuel Management System Operation

The fuel you depend on should always be in optimal condition. Periodic circulation of fuel assures optimal combustibility and fuel cleanliness. All major diesel engine manufacturers have set minimum fuel standards for the diesel fuel to be used in their engines, and failing to maintain fuel that meets those standards could lead to engine component failures and denied warranty claims. As an example, Caterpillar has published "Cat Commercial Diesel Engine Fluids Recommendations" (SEBU6251-17 September 2014 [a more recent version may be available]) that states "In order to meet expected fuel system component life, 4 micron(c) absolute or less secondary fuel filtration is required for all Cat diesel engines that are equipped with common-rail fuel systems." (Page 34) You should not assume that fuel being delivered to you meets requirements, and certainly fuel that has been in your storage tank for an extended period of time may not meet requirements of diesel engine manufacturers without a fuel management program. Additional cleanliness standards apply to diesel fuel. Caterpillar recommends that the fuel dispensed into the machine tank meets "ISO 18/16/13" cleanliness level." (Page 49) For more information on fuel cleanliness specifications and requirements, see this link>

Continued vigilance to assure that your fuel is the best condition possible and always meets the requirements to maintain engine manufacturer's warranty requirements should include an AXI Fuel Management System.

Smart Filtration Controller

The STS 7000 Series is equipped with the UL508A TSC-7000 Touch-Screen Controller that features advanced connectivity for more intuitive system setup and monitoring from remote locations. The TSC-7000 Series Controller is an HMI PLC UL508A controller with Modbus, TCP/IP, LAN and Internet connectivity for more intuitive system setup and monitoring from remote locations.

From the home screen you are able to access the different menus (Alarm History, Timer Configuration, Manual Control, Alarms, Filter Configuration, and Help). The Alarms menu is able to access the active alarms that are currently triggered. You are able to see in a more detailed explanation of what alarm is triggered. In the Manual Control menu you are able to change between which tanks you are wanting to polish with a multi-tank system. In the Configuration menu you are able to access IP setup and the menu to clear your Alarm History. The Alarm History menu is where you find a log of all the past alarms that were triggered.

Operational Safety Features

For safe operation, the STS 7000 Series Touch-Screen Controller triggers automatic alarms and shuts down the pump when fuel flow registers as restricted indicating that filters need service; a leak is detected; high separator water level, high filter vacuum; or high pump pressure occurs; or when the fuel flow is out of range. The unit is further equipped with a drip tray monitored by a leak detector.

System Operations

The principal components of the STS 7004 Tank Cleaning System are a continuous-duty motor with coupled gear pump, a Separ SWK 2000/18 primary filter/water separator with vacuum sensor and gauge, an LG-X 1500 Fuel Conditioner and a secondary water block fine filter with pressure gauge and sensor. The SEPAR primary filter protects the pump, coalesces and removes water and particulate. The patented AXI Fuel Conditioner prevents and reverses fuel degradation, agglomerization and microbial contamination. The secondary filter is a quick-change spin-on filter element designed to remove dissolved and emulsified water and contaminants down to 1 µ.

Preventative Maintenance Plans

Fuel Maintenance is an important part of a periodic engine preventative maintenance program that is common in all major industries today, but fuel condition is often taken for granted, Many of today's maintenance personnel have many years of experience, but until changes were regulated to diesel fuel within the past decade, these maintenance professionals were never presented with the problems we are experiencing today. With today's advances in design and engineering of diesel engines and the critical requirements that equipment have longer life cycles and near 100% uptime, fuel management can no longer be ignored. It is now just as important as changing the oil and ensuring the batteries are charged.

Preventive Maintenance Plans that have a fuel treatment component are essential. However, most service agreements do not cover fuel-related engine failures. Fuel has a limited shelf-life and even "fresh fuel" could contain water, sediment, microbes and bio-fuel components upon delivery.

Emergency power installations are especially susceptible to unexpected interruptions due to fuel related issues. Periodic generator tests-runs are too short to determine if fuel quality is adequate for the demands of continuous, full-load operation. In fact, generator test runs have been found to significantly accelerate the fuel polymerization and degradation process by returning fuel that has been compromised by heat and pressure back to the tank. Thirty minute tests, often performed every month, create the environment in the tank for problems to grow. After extended periods of testing, sometimes years, without the extended full load, operation is interrupted by clogged filters.

Now that you have decided to incorporate an AXI Fuel Management System into your Equipment Preventative Maintenance Program, there is still work to do. Consider the follow as part of your program to further assure that your equipment will run when it is need most, the repair costs are under control, and the bottom line is rising:

  • Do you make sure your storage tank and equipment fuel tank caps are always on and sealed?

  • Do you use AXI Broad Spectrum Fuel Catalyst Ultra Concentrate AFC-705 or AFC-710 every six months to enhance the breakdown and removal of sludge, slime, and bio-fuels from tank walls and baffles that are difficult to access and normal fluid flow does not break loose? Having this unique fuel additive present when fuel downstream equipment also assures that these downstream tanks are being cleaned in the normal course of operations.

  • Do you periodically use a Fluid Sampler or a hand Fuel Sample Pump to take samples of your fuel from each storage tank and utilize laboratory analysis to evaluate the condition of your fuel to assure your fuel supplier is providing fuel that meets the specification of the engine manufacturer you depend on to keep your equipment running?

  • Do you use a Portable Particle Counter to test each incoming load of fuel to assure that the cleanliness of fuel provided by your supplier meets the specifications of engine manufacturer that powers your equipment? Your engine warranty depends on it!

  • Have you installed Desiccant Breathers on all your fuel storage tanks to help prevent moisture from entering your tanks through the vent as fuel is consumed?

  • Do you use Kolor Kut Water Finding Paste at least every 60-days to monitor the accumulation of water in your storage and equipment fuel tanks?

  • Do you use Water Eliminators in each storage and equipment fuel tank to capture water and remove it before it can cause problems with engine operations or seasonally prevent water from freezing in fuel lines?

Optional Water Removal

The STS 7000 Series Fuel Maintenance Systems may be ordered with the optional Auto Water Drain ("AWD") that automatically removes collected water from a system water separator. The AWD is comprised of a DC gear pump, solenoid shut off valve, and strainer that will automatically remove water collected in the sump of the water separator when the system detects high water levels. The water is drained into a storage tank, external to the system. See the Specification Sheet available for review in the Literature section on the left side of this page.

Two-Tank Optional Installation

The Multiple Tank option for the STS-7004 is designed to allow for multiple fuel tanks to tie into a single fuel polishing unit. By integrating actuators that control the source of fuel being fed into, out of, or through the unit, controlled by an automated customer selected control sequence. The two-tank Multi-Tank Option may be chosen in the on-line shopping cart to order or just to see pricing information. If you require a system capable of maintaining more than two tanks, the multi-tank option on the STS-7010, STS-7030 and STS-7040 series equipment can ensure optimal fuel quality for up to four fuel tanks. For fuel systems requiring the maintenance of more than four fuel tanks, contact us for a custom engineered solution.