Question about 2003 Harley Davidson FLSTFI Fat Boy

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I have a 2003 fuel injected fatboy.. Where is the fuel vacuum line. Bike turns over but will not run.

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  • Harley Davidson Master
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Hi Cartercg, the fuel vacuum line is for carburetors only, when checking for spark the CKP needs to measure the compression bump in order to send the correct signal to the ICM/ECM so always check for spark with either a third plug grounded or lift the end of the plug boot 1/2 " off one of spark plugs that are in the head. and the usual suspects are:
1. Fuel tank empty
2. Fuel supply valve turned off.
3. Fouled spark plugs.
4. Engine flooded with gasoline as a result of over use of enrichner.
5. Fuel valve or filter clogged.
6. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched.
7. Discharged battery, loose or broken battery connections especially the negative cable at "BOTH" ends
8. Loose wire connection at coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, spark plug cable connections loose,
or cables connected to wrong cylinders.
10. Ignition timing incorrect due to faulty ignition coil, ignition module, or sensors " Manifold Absolute Pressure" "Camshaft Position Sensor" "Crank Position Sensor" "Brake Apply Sensor
11. Engine lubricant to heavy ( winter operation )
12. Sticking or damaged valves or push rod wrong length.
13. Primary cam sproket spline sheared or missing spacer.
14. Security alarm system not disarming.
For a primary suspect please visit the website below. Good luck and have nice day.
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley... Set Change Override Transport Harley Security Alarm PIN Code No Key Fob...

Posted on Jun 28, 2015

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Posted on Jan 02, 2017

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SOURCE: Is it possible to clean the fuel pump of my 2002 Fatboy FLSTFI?

Try running sea foam a couple of times.

Posted on Apr 10, 2009

polarcycle
  • 1392 Answers

SOURCE: Fuel injection Harley Davidson 02 Fatboy

System is self bleeding. You may have disturbed some debris that has gotten in the fuel injector/s. Try running some fuel injection cleaner through it and see what happens.

Posted on Jun 30, 2009

OneRide
  • 379 Answers

SOURCE: HD 1979 fatboy fuel petcock valve leaking

Replace the petcock. The rubber diaphragm is ruptured. I'd also bet your fuel mileage dropped cause the ruptured diaphragm is allowing raw fuel to be sucked into the intake manifold.

Posted on Jul 23, 2009

  • 25 Answers

SOURCE: 01 fatboy speedometer does not register.

Remove speed sensor in G/Box (behind starter motor) clean the end of sensor as it will have metal filling on it which can stop the sensor from working.If no luck the sensor it self would have failed which is very common

Posted on May 22, 2010

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1 Answer

How to remove gas tank 2010 fat boy


Shouldn't be too different than any other bike. Take off the seat first. Turn the fuel switch off (actually it probably has a vacuum switch so just remove the fuel line) Unbolt the base and slide the tank off. Careful of snagging any stray lines while you're at it.

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Hi Anonymous, on a Softail remove seat and directly behind the battery is a black plastic box. The cover slides up and off revealing the starter relay and the system/fuel pump relay for you injected folks and the various assorted circuit fuses. Good luck and have nice day.

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1 Answer

2003 fatboy starts runs for about 3 seconds and quits. Alarm is off, fuel is good, batteries replaced in key fobs. Whats wrong?


Hi Ron, and the usual suspects are:
1. Severely discharged or damaged battery.
2. Loose, corroded or broken battery cable.
3. Alternator not charging or below normal rates.
4. Failed ignition coil, ignition/electronic module.
5. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor.
6. Faulty ignition switch.
7. Water or dirt in fuel system, carburetor or filter.
8. Fuel tank vent system plugged or gas cap not venting.
9. Fuel tank empty.
10. Fuel valve vacuum line broken or carburator vent line closed off.
11. Restricted, blocked or kinked fuel line.
12. Failed fuel pump, pressure regulator and or fuel injectors.
For a prime suspect please visit website below and good luck:
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Hi my name is angelo an i wanted to no if you can start a sv1000s without a fuel pump?


hi the answer is no, this bike is fuel injection which requires high pressure, will not work with gravity fed system

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When bike is sitting up right it bogs out and back fires won't stay running, but if put the kick stand and lean it to the side it clears up and runs good and when stand staight up again it starts to bog...


I would say you have problem in the tank with the fuel pump line. When you lean the bike on the kickstand all the fuel goes to the left side an covers the line which then creates enough fuel pressure to run the bike. If you filled the tank full it would probably run ok until the fuel level gets below the bad line.

Oct 05, 2010 | 2003 Harley Davidson FLSTCI Heritage ...

1 Answer

Idles high and misses when cold. after you run it for a while it runs normal


You didn't say whether your bike was fuel injected or carbureted. A fuel injected bike or a carbed bike with the enricher pulled out will idle high. It is supposed to. Now, it should not miss though. It might be time for a new set of spark plugs. The enricher runs a very rich mixture and will foul a plug if you run it too long. I always tell people to only run the enricher just long enough so you can keep the bike running with the hand throttle. Turn the enricher off as soon as possible to prevent fouling a plug. If the bike is fuel injected, you'll have to take it back to the dealer to have it adjusted.

Good Luck
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1 Answer

2002 Harley FatBoy Fuel Injected. It ran good one day and the next it wouldnt stay running, it will start but only run for a second or Two. I can keep it running if I spray carb cleaner in the throttle...


Hi Fireman28, and the usual suspects are:
1. Severely discharged or damaged battery.
2. Loose, corroded or broken battery cable.
3. Alternator not charging or below normal rates.
4. Failed ignition coil, ignition/electronic module.
5. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor.
6. Faulty ignition switch.
7. Water or dirt in fuel system, carburetor or filter.
8. Fuel tank vent system plugged or gas cap not venting.
9. Fuel tank empty.
10. Fuel valve vacuum line broken or carburator vent line closed off.
11. Restricted, blocked or kinked fuel line.
12. Failed fuel pump, pressure regulator and or fuel injectors.
For a prime suspect please visit website below. Good luck and have nice day.
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

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1 Answer

Fuel injection Harley Davidson 02 Fatboy


System is self bleeding. You may have disturbed some debris that has gotten in the fuel injector/s. Try running some fuel injection cleaner through it and see what happens.

Jun 30, 2009 | 2003 Harley Davidson FLSTFI Fat Boy

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