Bogs under throttle. CAN ANYONE HELP?
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Junior User
Joined: Oct 2013
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Bogs under throttle. CAN ANYONE HELP?
Its 30 psi at the rail which makes me believe its the injectors. It was my fathers truck. Its an 89 f250 460. He passed. His girlfriend wanted to sell it for 50 bucks. I took it. She stole everything else.Any way, koer codes 12
21
41
18
77 or 78?
Koeo codes
32
96
It idles fine. Timing is good. But if i push the throttle it will bog down and the fuel pressure will drop unless i let off the gas. Ive replaced maf sensor, tps, fuel filter, fuel pump, passed the broken fuel switch diaphragm so im running off front tank. Also, does the maf vacuum go to the top or bottom throttle body nipple? Thanks.
21
41
18
77 or 78?
Koeo codes
32
96
It idles fine. Timing is good. But if i push the throttle it will bog down and the fuel pressure will drop unless i let off the gas. Ive replaced maf sensor, tps, fuel filter, fuel pump, passed the broken fuel switch diaphragm so im running off front tank. Also, does the maf vacuum go to the top or bottom throttle body nipple? Thanks.
Lead Driver
Joined: Jan 2019
Posts: 5,070
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From: N.W. Alabama
this will help scroll down to page 4 where 2 digit codes start
Ford OBD1 Codes and Procedure Fuel Injection Transmission (Mechanics)
Ford OBD1 Codes and Procedure Fuel Injection Transmission (Mechanics)
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
You have a fuel delivery problem, fuel pressure should NEVER drop no matter what. On that truck the dual function resovoir is the prime suspect unless somebody did some stupid like eliminating 1 tank and looped the hose at the DFR.
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Junior User
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I might be that stupid guy because i bypassed the dual function reservoir thinking that was it. I cleaned it over and over and it never worked properly i thought. The truck would stumble and overflow one of the tanks and i thought that was the culprit. I know what the codes mean. I just put them up because other people would want to know what i found in diagnostics.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
You were right, if one of the tanks is overflowing the DFR isn't working correctly, that should never happen. The question now is exactly how did you "bypass" it? If you accidentally created a loop somewhere then the pumps will struggle to build pressure. There should be 40psi(V8s only.. I6 is 50psi) available at the motor at all times, the regulator reduces this to 32psi when vacuum is present at the regulator.This pressure should also remain when the engine is shut off although in your case if you have completely bypassed the DFR then that may no longer happen as it contains the check valves that make this possible. There is also a single function resovoir for this this vintage truck designed for single tank applications, this system really needs the resovoir portion as a buffer between the low pressure in-tank pump and the frame mounted high pressure pump as the high pressure pump will starve without it under some conditions.
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Junior User
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I will check for loops. I just bought the ford fuel steel line extensions to bypass it. I didnt know there should still be a single pump reservoir there. Just in case those two arent it, what would common knowledge tell you what else it could be besides the things that ive already replaced obviously. Thank you so much for your help and timely replies.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The correct way to delete a tank is to cap the ports going to it coming out of the DFR, DO NOT loop any together.
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Junior User
Joined: Oct 2013
Posts: 66
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Would that be the cause of my issue? It seems plenty of people got rid of the reservoir to a single tank system and didnt have these issues. Is that what youre getting off the codes i provided?
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Yes. A good DFR will properly isolate both tanks so this may not matter but yours is malfunctioning and leaking from one tank to the other so when an input and output are looped together a short circuit is created that will bleed off pressure.
Yes.. although totally removing it may cause other issues
No, the EFI system doesn't know what components are in the fuel system and it doesn't even monitor fuel pressure. The codes you are getting may or may not be related to this problem so you may still have other things to fix but your biggest problem is definitely with the fuel system.
No, the EFI system doesn't know what components are in the fuel system and it doesn't even monitor fuel pressure. The codes you are getting may or may not be related to this problem so you may still have other things to fix but your biggest problem is definitely with the fuel system.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Do you still have any of the ports looped together? If so remove the loop and cap each one individually
Hotshot
Joined: Jun 2015
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Just for clarification, you put a “new-to-you” DFR on it and reconnected the other fuel tank or is it still disconnected?