I have a 2004 Ford Crown Victoria. I am having an intermittent problem with my fuel system. Sometimes the vehicle will stall on its own, after checking the under hood fuse panel i can see that the No.5 fuse is blown. I have changed the fuse and it immediately blows again. I have suspected both the fuel pump and the fuel pump relay No.203 to no avail. Sometimes the vehicle runs fine but right now its stuck in the driveway blowing through fuses.
Fortunately the problem of a shorted pump or shorted wire is present giving you the opportunity to find the problem.
Be careful and deliberate to not jiggle the wires correcting the problem for it just to happen again when you least expect it. The defect can also be a chaffed wire where the insulation has been worn away.
If possible disconnect the fuel pump connector. Check for a short in the wire. Suspect that the wires where they are close to exhaust have melted the insulation. Remember to inspect and check as you displace the wires to try to locate the defect.
Any wires near the catalytic converter are suspect do to the intense heat.
Check the resistance of the pump. About 2 ohms or greater. Some are as low as 1 ohm (12amp)
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SOURCE: E.E.C fuse keeps blowing in 1991 Ford Explorer
if you replaced fuel pump i would look at backward wiring when replaced and i would start at the source of work if your vehicle was working fine before replacement then 9 out of 10 it will be your fuel pump wireing
sometimes when putting wireing back together the connectors have the missing clip and in turn you can turn the wireing in both directions now where positive is touching the ground on both sides of connector kris kross problem check your work this is crucial use a test light to find the right wires where they go
SOURCE: 2005 ford ranger fuel pump relay gets hot and engine dies
Like Laurie Mack said. It is the inertia switch below the glove box. Here is some funny information. DON'T change the fuel pump first. Interesting fact: I bought the new inertia switch from Ford and the install instructions that came with it said to install the switch in the protected area to the right where the fuses are. It is like Ford knows it was a dumb place to put the inertia switch, but they won't let you know until after you buy a new one. I have read at least 20 other people on here that had the same problem I just had.
SOURCE: ford explorer eec relay
Try a new relay first. This may not be good news if that does not work. If you can find the EEC (computer) and unplug it, then replace the fuse-if it blows you have another cheaper part on the circuit thats bad.
If the fuse does not blow, then the EEC must be shorted.
If you have to replace the EEC you may find a kindly dealer with a cash-for-clunker sitting there to violate. Salvage yards have them, Ebay sells them. I have seen them at swap meets for $20. They are a high price part even rebuilt at Dealers or autoparts stores.
SOURCE: Intermittent fuel pump engagement when turning key - 2001 Taurus
try cleaning the connector that goes to the fuel pump, sometimes they corrode on inside. If that does not fix, test the wires feeding fuel pump with a multi meter until the condition shows itself again, if voltage drops to zero or very low then wiring problem, if voltage is unchanged with problem and fuel pump is not working and connectors are all clean, try replacement of fuel pump.
SOURCE: 90' Ford F150 Lariat 4.9 inline 6 cyl w/ EFI and 2
The fuse for the fuel pump is pretty much the toggle switch between tanks, if that goes out, you will not have either tank.. IF you had an accident, there is a kill switch somewhere behind the dash on that truck that disables the fuel pump and must be reset.
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