Gulf Coast Filters Specializing in Bypass Oil filters, Fuel filters, Hydraulic filters and Custom filtering



Gulf Coast Filters

About Us 
Customer Comments
Meet Some Of Our Customers
Frequently Asked Questions
Why do we change oil
How do I eliminate routine oil changes
Why Bypass Filters
Our Guarantee
Contact us
Filter Installation
GCF Element Change Instructions

Oil Analysis

GCF Oil Analysis program

The Oil Quality



1,000,000 Miles We Did It
Power Stroke Registry Review
North Carolina D.O.T
Turbo Diesel Registry Magazine

GCF Customers

Pepsi Cola Letter
Satisfied Users
Other Letters

Test Results

GCF vs. small competitor filter
Offshore Drilling
Scott Paper Co.

Gulf Coast Filters
High Quality Filters
for Over 30 Years!


The Problem:

Contaminated Fuel (Diesel or Gasoline)

The Causes:

Storage, condensation, transfer operations, sloppy maintenance procedures, chemical reactions, and other causes.

The Result:

Damaged storage tanks, fuel tanks, filters, injector pumps, injectors, and finally, DOWNTIME.

The Solution:

Install a GCF Filter (single, or in banks of 2 or more, depending on the volume desired).


  1. First, and foremost, IT WORKS.  The GCF Fuel Filter is positively the best buy on the market today.  It is simple to install, and even more simple to service. 
  1. The GCF element is massive and can hold larger amounts of contamination.  The GCF Fuel Filter is a depth type filter, allowing it to trap microscopic size particles out of the fuel.

Click photo to enlarge

  1. Conventional filter elements (Primary and/or secondary filters presently on your engine) will last many times longer when the GCF Fuel Filter element is serviced at necessary intervals (at the first loss of RPM or an increase of 3-5” above clean reading on vacuum gauge).  Clean filter reading on vacuum gauge ideally should be 0”, but never over 7” under maximum load.  Higher readings than 7” indicate additional filter(s) needed in parallel.
  1. Inventory costs are drastically lowered since conventional elements are seldom replaced and since the GCF Fuel Filter element is the same for all engines.
  1. Contrary to popular belief, water is not the primary cause of downtime in a diesel engine…. It is all of the other Contaminates combined.  Water can be effectively removed with simple water-traps.  The element used in the Gulf Coast Fuel Filter not only cleans but “dries” the fuel.  Compare any conventional filter element with the element recommended for GCF’s Fuel Filter and there is where the comparison ends.



GCF Filter Element Change Instructions:

F-1 Fuel Filter

  1. CLOSE Input & Output Valves 

  2. Remove Lid.

  3. Open ½” drain valve to remove excess fuel from housing. 

  4. Grasp washer (handle) and slowly lift element assembly from  housing.

  5. Hold guide-positioning plate with two middle fingers inserted into center tube.  

  6. Unscrew and remove the element hold down assembly nut.  No tools are needed; the nut is installed HAND-TIGHT ONLY.   

  7. Remove the used GCF element from the GCF Center Tube and set aside.  Now replace with a new GCF Model E-1 element.  Insure to properly dispose of the used GCF filter element.

  8. Tighten element hold down assembly nut.

  9.  Slide element assembly back into filter housing.

  10. Slowly fill with clean fuel.  (BE SURE DRAIN IS CLOSED)  It will take 1 ½ to 2 gallons and about 3-5 minutes for air bubbles to escape new element.

  11. Reinstall the lid assembly as tight as possible using both hands. DO NOT USE ANY TOOLS OR CHEATER PIPES.

  12. Open Input & Output valves.

  13. Start engine and insure operation.
    NOTE!  If vacuum gauge still has a high reading check condition of engine filters and/or remove and clean GCF baffle in bottom of filter housing.



Remove element assembly.  Reach down into filter housing and grasp rubber washer and lift out of filter housing.  Grasp top of baffle and slowly lift out of filter housing.  Clean with air or conventional shop solvents.  Insure rubber-sealing washer is placed on top of baffle when finished.






By-Pass Recommendations

With the by-pass valve Closed, and the input and output valves open, fuel is passed through the filter.

By opening the bypass valve, then closing the input and output valves, the fuel is by-passed directly to the filter(s) on the engine.

By-passing should only be done in emergencies since whatever Contaminates are causing the necessary change will then go to the engine filters and eventually the engine injector pump and injectors.

Parts List: (All 3/8”)

3    Ball valves (or equivalent Gate valves)

2        90 degree Els

3        Tees

7        Close nipples

4        3” nipples

1        Vacuum gauge

1        ½” drain valve

2        Hose clamps or swivel connectors

Hose length as required (#10 hose)

Filter must be installed vertically.


Click photo to enlarge



Gulf Coast Filters, Inc. warrants each GCF Filter to be free from defects in workmanship and materials for the lifetime of the Filter for the original purchaser.  During this time, GCF, Inc., will repair or replace any GCF Filter part(s) proven to be defective in either workmanship or materials.  The original user must provide receipt of purchase.  This is the total liability and responsibility of Gulf Coast Filters, Inc.


Home page / About us / Contact us

Copyright © 2002-2005 Gulf Coast Filters, Inc.  All Rights Reserved.
Gulf Coast Filters
P.O. Box 2787
Gulfport, MS  39505