I recently purchased a 2002 Harley Wide Glide and noticed my fuel guages goes from full to empty pretty quick. I know the bike has a 5 gallon tank but when almost on empty I can only get a little over 2 gallons in it.

Hi, Ed and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the choke.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Quick disconnect check ball stuck.
14. Compression below 75 PSI.
15. A stuck-bent-burnt valve.
16. Improper valve clearance (too tight)
17. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
18. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
19. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
20. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections are loose or connected to the wrong cylinders.
21. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
22. Faulty neutral, clutch, kickstand safety switch.
23. Faulty fuel pump or fuse or relay.
24. Faulty or corroded run/stop switch.
25. Tilt sensor needs a reset.
26. Security system not disarming alarm needs a reset.
27. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://www.hdforums.com/forum/dyna-glide-models/613242-dyna-wideglide-cranks-won-t-start.html
http://www.mediafire.com/file/n32mo9rud2vadf4/2002_Harley_Dyna_Service_Manual.pdf/file
https://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
http://mybikemanuals.com/harley-davidson/harley-davidson-dyna-glide-owners-manuals/
https://www.6ya.com/how-6ya-works to speak to me personally.

OFF whenever engine is off
ON during normal running
Fuel when bike starts jerking, because of running out of fuel. Turns on RESERVE (about 1/2 gallon left).

Hi, Anonymous the following is a systematic procedure for diagnosing fuel pump issues designed to keep "DRACHMA" to a minimum:
1. Normal fuel pump pressure is 55-62 PSI.
2. Check the white plastic convoluted tubing for age-related pinholes by removing and plugging the end that connects to the quick disconnect check valve and then turn on the ignition switch and look for fuel streams exiting the pinholes, if any exist, replace tubing as necessary. $38 from Harley $20 from eBay.
3. Check for a clogged primary fuel filter that comes off the bottom of the pump to screen out big rocks and clean as necessary.
4. Check for a clogged secondary fuel filter by removing it from the system and replace it with a short splicing tube turn on the ignition switch and recheck fuel pressure if pressure increases to the normal pressure you need a new filter $ 166 from Harley $40 from Drag Specialties on eBay.
5. If all the above check out OK then you need a new fuel pump $ 324 from Harley $ 60 from Amazon and eBay.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at [email protected]. Good luck and have a wonderful day.
https://www.hdforums.com/forum/dyna-glide-models/272714-fuel-pump-problem-help-neeeded.html
http://www.mediafire.com/file/jl8r784mf99v62w/2007+Harley+Dyna+Service+Manual.pdf
https://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
https://ownersmanuals2.com/harley-davidson/wide-glide-2007-owners-manual-66493
https://www.6ya.com/ to speak to me personally

The vent between the tanks is located under the tank panel. The fuel vent is in the right side gas cap. Did you check to make sure fuel was flowing out of the right tank while you had the crossover hose off?

Good Luck
Steve

If you will contact me directly at [email protected] I'll send you a complete trouble shooting guide to a fuel gauge. It's for Dyna Wide Glide but it should be the same gauge just mounted a bit different. Don't forget to remind me of what you need.

Good Luck
steve

It sounds as if your guage is grounded out. Check the electrical lines from your guage to the tank sender to see if one of them is cut or damaged and is grounding out to the frame of the bike.

I just changed mine and it only took about an hour and a half.

not running for a year! You have a varnish buildup in the low end circuit of the carb. You will need to remove the carb and do a full teardown of the carb to properly rectify this problem. SOMETIMES we are able to free up the passages by putting SEA FOAM cleaner in the tank , fill her up with fresh fuel and ride through the tank and it will clear up. SEA FOAM can be purchased at an auto parts store and is sometimes very effective. 1/4 cup to full tank fuel.

It sure will!! You answered your own question. guess i get no points for this one.

Fuel pump is in the tank. Check your fuses.