Hi Chris, continuing our troubleshooting. So I had a broken fuel pump from my old vegas sitting on the shelf, swapped the regulator, cleaned the tank, put the pump back in and boom 51psi! Newer EFI bikes feature a check engine light on the kill switch that blinks a code indicating the problem but a bad fuel pump might just need a new filter. Replacing your fuel pump with a new genuine OEM part can be expensive. You Might be Experiencing Fuel Pump Failure if Your Car Jerks or Sputters at High Speeds Photo by Takashi Hososhima on Flickr / CC BY-SA 2.0. So it's a no-brainer that a malfunctioning fuel pump is bad news. 6 and the pump will run, proving that the pump is getting both power and ground, and the connector through the tank is good. this was the first test you asked me to do, but it … Failure of external tank fuel pumps is often due to the points. The fuel pump's job is pretty self-explanatory: to pump fuel from the gas tank to the engine. 6. 1. This is because the engine vibrates. The points can get a lot of dirt and corrosion underneath the protective cap. Car Surging. Broken Motorcycle Fuel Pump? Fuel pressure regulator was barely holding on and the tank and the filters were filthy. If an engine lacks a functional fuel pump, that engine will “starve” and immediately stop running. We are pretty sure that it is a bad fuel pump. There are warning signs that you need to check into repairing or replacing your fueling motorcycle parts. These guys didn't do a thing in that tank. The pump should never be mounted on the crankcase of the engine. I can hot-wire the left side of fuse no. The pump should be mounted, keeping a distance away from the crankcase. Loud Whining or Droning. Fuel pump repair and replacement is very important. I took the fuel pump relay out and it bench-tested good. One major sign of a failing or an old motorcycle fuel pump is a clear loud whine or howl when operating. Refer to an application specific repair or service manual to help you identify and locate the mechanical fuel pump in your particular vehicle, as they can vary widely in appearance and location. the replacement fuel pump didn't change anything. The fuel pump is responsible for getting the fuel from the gas tank to the engine so the bike will run without sputtering or stalling. I can jumper the relay socket terminals and run the pump, so the wiring is good. It’s also critical to install motorcycle fuel pumps in the correct way since if it’s done wrong, the entire system can be damaged. Injector problems can also mimic fuel pump problems. Irregular resistance inside the fuel pump motor may cause vehicle surging, and indicates a fuel pump in need of repair… If the fuel pump is the cause, it means it can no longer regulate fuel pressure accurately and provide the appropriate amount of fuel to the engine. The fuel pump in the tank is not running. 1. Mechanical fuel pumps are usually found on the engine, rather than in the fuel tank, because they rely on the crankshaft to power them. [11] If you’re driving at freeway speeds and notice your engine sputter or jerk, you may have a failing fuel pump. If you can’t correct the problem with a good cleaning, there is a solution to replace the points contact. i bought a 12v lamp type tester and there is no voltage present at the injector connector when turning over the motor. The following failure signs in motorcycle fuel pumps can help detect a problem allowing quick fuel pump repair. Today's technology doesn't always offer an immediate and exact solution. It's important to familiarize yourself with the warning signs of a faulty fuel pump—that way you can address any problems before it's too late. Diagnosing the problem often gives seasoned mechanics a headache. 1. Hey guys, I am working on a friends bike, a 01 1500 Vulcan Nomad that wont start. 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