A fuel pump no run condition will be usually be power related, in the form of an electrical issue; a faulty relay or have it’s failure internal to itself. Many problems are electrical in nature as the fuel tap requires a consistent 12-volt power feed to operate. Even if voltage falls to 11 volts, this may be enough to keep the pump not running correctly; and no power means no operation. If you suspect that weakened voltage may be the problem, testing both the battery and other connections involved with a multimeter can help diagnose whether loose wiring or corrosion in them is to blame. Cheap jets are a sensitive matter, even if the drop is slight because such develop small risks can reduce fuel flow by as much as 10% and technicians recommend controlling every ≈50 thousand miles to make sure everything stays stable.
Another common culprit is the fuel pump relay, which is a small part that governs whether or not power gets sent to your electrically-operated fuel pump in the first place. In this case, if the relay works improperly, it would lead to stopping of pump running due lack of feed from power. Fuel pump relay longevity is typically rated at around 100,000 miles, but extreme heat or voltage changes can lead to premature failure. With a price of between $10 to $30 for an average relay and the pump is functioning normally when the faulty one replaced, purchase a full new replacement is likely not needed. A professional can easily test the relay with a jumper wire or relay tester to verify if it works fine.
Pump Failure – The pump itself or even most likely the former holds up as pumps wear out, fuel filter clogs due to higher mileage vehicles. Many fuel pumps, based upon driving conditions must average 100 and change thousand miles per hour on highway. On average, the pump will increase its operating temperature by 10-15% when run at low-fuel conditions for long periods of time because it is not cooled sufficiently and this can further reduce lifespan. An aging or overheated pump will continue to burn out until it can no longer run. The American Automobile Assn. reports that motorist calls for roadside help on a variety of subjects hit an all-time high last year, but among the leading causes were fuel pump failures, which in 2012 accounted for approximately one out of every ten callouts.
A clogged fuel filter can also mean the pump cannot run, as excess resistance will compel it to exert itself and potentially overwork, which runs a risk of motor failure. To prevent this issue, proper filter changes (every 20 – 40,000 miles) should be carried out regularly. An ounce of prevention is worth a pound of cure, after all, as Benjamin Franklin said. The lifespan of the pump increases and contamination can be reduced by securing a stable power supply for running, on/off control testing utilizing relay, cleaning filters.
As we just explained there are commonalities behind why a Fuel Pump is not working and looking at all of them step by step normally leads to the answer in short order which makes for rapid repairs. You can prevent the fuel pump from failing, such as checking and maintaining regularly.