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Go Back   ClassicBroncos.com Forums > 66-77 Ford Bronco > Bronco Tech

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Old 03/02/19, 02:47 PM   #16
UTbronco
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Quote:
Originally Posted by JLBachs View Post
Any chance you could have a plugged fuel strainer in the tank causing the pump to work as hard as it possibly can?
Hmmm, maybe I guess. We'll check it out -- thanks for the idea.
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Old 03/02/19, 06:22 PM   #17
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Originally Posted by UTbronco View Post
Yes, definitely hear the pump run for a few seconds then stop just prior to cranking the starter. I don't believe we have a fuel return going from the fuel pressure regulator so that's something we'll take a look at. Thanks for the response!
yeah if you don't have a return it will burn up the pump

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Old 03/03/19, 08:21 AM   #18
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I have a crate motor and then went to EFI. I had this long running issue of the engine dying. It was never consistent and a real pain. Before I did the EFI, I swapped out the mechanical fuel pump, voltage regulator, and ignition coil trying to solve the problem. Same issue. I did the EFI conversion a few months ago. Same issue. It turned out to be a bad ignition control module. As soon as I started to unplug it, the connectors basically fell about. $25 part that should have been replaced a long time ago.

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Old 03/03/19, 10:48 AM   #19
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An EFI fuel pump without a return is a dead headed fuel pump. You are probably warming up on 90 PSI of fuel pressure. Warmed up the fuel pump is probably overheated from running overloaded.

Bad ignition typically shows up hot as well. Without an ignition signal the fuel pump won't run except for the initial prime.

So much sounds like it could be a problem. I wouldn't be surprised if you have multiple fixes to get things right.

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Old 03/07/19, 03:54 PM   #20
UTbronco
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Quote:
Originally Posted by BGBronco View Post
I have a crate motor and then went to EFI. I had this long running issue of the engine dying. It was never consistent and a real pain. Before I did the EFI, I swapped out the mechanical fuel pump, voltage regulator, and ignition coil trying to solve the problem. Same issue. I did the EFI conversion a few months ago. Same issue. It turned out to be a bad ignition control module. As soon as I started to unplug it, the connectors basically fell about. $25 part that should have been replaced a long time ago.
Oh dang! Well shoot, I'll add this to the list to check too. I'm tired of not being able to drive in the summer for more than just a few mins at a time.
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Old 03/07/19, 03:55 PM   #21
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Quote:
Originally Posted by Broncobowsher View Post
An EFI fuel pump without a return is a dead headed fuel pump. You are probably warming up on 90 PSI of fuel pressure. Warmed up the fuel pump is probably overheated from running overloaded.

Bad ignition typically shows up hot as well. Without an ignition signal the fuel pump won't run except for the initial prime.

So much sounds like it could be a problem. I wouldn't be surprised if you have multiple fixes to get things right.
Yeah, definitely going to look into the return and the ignition as a starting point. Hopefully it's an 'easy' find.
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Old 03/08/19, 08:16 AM   #22
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Originally Posted by needsmoarturbo View Post
Another thing to check would be the tfi ignition module thing that is mounted to the distributor base. Those will crap out when hot.
This. Had the same problem with an '89 F-150. Kept thinking it was the fuel pump, but it was that damn module. Good luck!

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Old 03/08/19, 02:03 PM   #23
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Pull codes

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