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c34morales
New User
Aug 2, 2011, 4:54 PM
Post #1 of 5
(1241 views)
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2001 Mercury cougar v6 2.5 dual cam 130kmi. not getting any power to fuel pump. fuel pump changed and car started, after 60miles car died and ignition coil changed, battery and fuel pump again. relays and fuses have been checked and still no power to fuel pump. could fuel pump switch be stuck and if so how do I reset?
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 2, 2011, 5:06 PM
Post #2 of 5
(1229 views)
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Re: Fuel pump power
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Aug 2, 2011, 5:07 PM)
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Sidom
Veteran
/ Moderator
Aug 2, 2011, 5:42 PM
Post #3 of 5
(1222 views)
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Re: Fuel pump power
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If you are talking about the inertia switch, it should be in the truck somewhere behind a panel. There is a push button on it that pops up when it gets tripped, just push the button back down to reset it.....
You could also check to make sure it's getting power to & thru it...........
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JackThomas
User
Aug 3, 2011, 9:59 PM
Post #4 of 5
(1203 views)
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Re: Fuel pump power
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Get a fuel pressure gauge & leave it connected while you drive. Don't let it distract you from watching where you're going, but try to notice what it does just before & during the stall.
The connector on that style of hi-pressure pump is known to loosen, but
it's easy to repair. There's a molded hard plastic connector near the
pump clipped to the frame rail - that's NOT the one. Follow those wires
down to the pump, where they go into a rubber boot. Slide the boot up
to access the terminals. Pull one off at a time, crimp it slightly
tighter with pliers, & put it back. Reinstalling the boot is a
challenge, but it's doable.....
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Sidom
Veteran
/ Moderator
Aug 3, 2011, 10:31 PM
Post #5 of 5
(1197 views)
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Re: Fuel pump power
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This is a "no start" condition the op is dealing with.
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