Replaced fuel pump now it cranks but no start

  • 1 POST
  • 3.2L
  • V6
  • FWD
  • 246,000 MILES

Changed the fuel pump on my vehicle, yet it cranks over but wont start. The new pump looks different than the original one. Was not getting any fuel pressure to my rail line and decided to change the fuel pump. Once I did, there was a wire that goes to the fuel pressure regulator /fuel filter, but in the new one does not have it. It looks like it has it in the inside. Having problems since!

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have the same problem?
Saturday, September 3rd, 2016 AT 4:23 AM

1 Reply

  • 21,076 POSTS

If the new pump was different without any explanation, then you have the wrong pump.

You should be verifying power and ground arriving at the pump before even changing the pump the first time. There are many more possible reasons for not having fuel pressure.

You really should be testing other things also before condemning the pump.

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 is not 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 information 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 positive 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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Saturday, September 3rd, 2016 AT 5:18 AM

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