cutting out and more
Cargo Master
Joined: Dec 2003
Posts: 2,735
Likes: 38
From: Sunny Florida
I would check the timing chain for play. Rotate the motor one way stop and mark the balancer and then rotate the motor the opposite way until the rotor button moves and mark again. Now you can see how many degrees of play you have in your chain. It only takes a few minutes.
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Laughing Gas
Joined: Nov 2002
Posts: 1,143
Likes: 18
The fuel pressure checked out at 31 psi. The mechanics there were clueless about what could possibly be wrong. They didn't give me squat for info. They just shook their heads.
Here's a review: (a list of all that's been done that is fuel related; in order)
1. High pressure pump quiet before overhaul.
2. High pressure pump loud after overhaul, but the truck seemed to run fine.
3. Replaced fuel pressure regulator. No change.
4. Replaced h. p. fuel pump. No change.
5. A year later: Another h. p. fuel pump and fuel filter. Mechanic dumped a cup or so of Automatic Transmission Fluid into the tank to see if it would quiet the pump. No change in noise, but truck hesitates and cuts out.
6. Three days later: Another h. p. fuel pump and filter. No change.
7. Truck acts the same on both tanks.
8. Hesitates, then pops if hard on the gas from idle.
9. Cuts out over 2000 rpm's while driving.
10. When driving, it feels like it's pulling a load.
11. Fuel pressure is at 31 psi.
Engine was overhauled a year and a half ago. I only have 8,000 miles on it. Only an engine kit was put in when overhauled.
Here's a review: (a list of all that's been done that is fuel related; in order)
1. High pressure pump quiet before overhaul.
2. High pressure pump loud after overhaul, but the truck seemed to run fine.
3. Replaced fuel pressure regulator. No change.
4. Replaced h. p. fuel pump. No change.
5. A year later: Another h. p. fuel pump and fuel filter. Mechanic dumped a cup or so of Automatic Transmission Fluid into the tank to see if it would quiet the pump. No change in noise, but truck hesitates and cuts out.
6. Three days later: Another h. p. fuel pump and filter. No change.
7. Truck acts the same on both tanks.
8. Hesitates, then pops if hard on the gas from idle.
9. Cuts out over 2000 rpm's while driving.
10. When driving, it feels like it's pulling a load.
11. Fuel pressure is at 31 psi.
Engine was overhauled a year and a half ago. I only have 8,000 miles on it. Only an engine kit was put in when overhauled.
Last edited by 88grandmarquis; Jan 11, 2004 at 05:26 PM.
Moderator
Joined: Jan 2001
Posts: 57,023
Likes: 2,754
From: Virginia
31psi sounds a little low. I thought it should be around 38 to 40psi. What you need to do is check the pressure when you get out on the road, and the engine has some demand on it. That's when it pops. Also, did they pull the vacuum line off the fuel regulator whe they were checking the pressure? The pressure should jump up whe you do this. This is a good test of the fuel regulator.
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Laughing Gas
Joined: Nov 2002
Posts: 1,143
Likes: 18
I'm gonna go pick up my own fuel pressure tester tomorrow and check it out. They didn't tell me a thing other than the 31 psi. They pretty much just pushed me on my way, just like the other shop I went to last week. I'm just gonna do things myself from now on.
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Laughing Gas
Joined: Nov 2002
Posts: 1,143
Likes: 18
Looked over the fuel lines tonight that run behind the engine. There are two lines that come up to the rails. The rubber lines were pretty loose where they connect to the plastic ends by the engine. Ar they supposed to be loose? Should I try hose clamps on these? Are both lines to bring fuel up, or is one a return line? Would it be a bad idea to just replace those two lines?
Chiltons manual says there is a special tool to disconnect the fuel lines and gives a code number. What is this tool called? Also, it gives a code for a special tool to de-pressurize the fuel system. Is there a name for this or can you just press the valve with something else?
Sorry for all the questions. I'm trying to nail this thing down, but I'm learning in the process. Seen that the radiator is leaking again. Just more to fix.
Chiltons manual says there is a special tool to disconnect the fuel lines and gives a code number. What is this tool called? Also, it gives a code for a special tool to de-pressurize the fuel system. Is there a name for this or can you just press the valve with something else?
Sorry for all the questions. I'm trying to nail this thing down, but I'm learning in the process. Seen that the radiator is leaking again. Just more to fix.
Senior User
Joined: Nov 2003
Posts: 186
Likes: 0
From: Over here
88grandmarquis..Did you find your fuel prob. ? I was cking over some posts and read yours again. I just changed all of my pumps cause of age and to quit guessing on these. and when I pulled my back tank unit I found the rubber (pump to steel line) connector was rotted thru , this could be your prob.
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Laughing Gas
Joined: Nov 2002
Posts: 1,143
Likes: 18
I put clamps on the loose fuel lines just behind the engine, but that didn't change anything. With the cold weather and being busy I haven't been able to mess with it. I'm planning on saving up to pull both tanks to clean them and replace the pumps. The list of things to do to the truck is getting longer. Winter reminded me that I need a new radiator (should have been done last year).
I was doing some searches and came up with some interesting info. Read that if you leave your tanks with under half a tank for a long period of time that stuff can dry out and cause problems. I had parked the truck for a year or so back on the farm with both tanks empty. No doubt part of the problem.
I'll update you guys when I get something done. Hopefully sooner than later.
I was doing some searches and came up with some interesting info. Read that if you leave your tanks with under half a tank for a long period of time that stuff can dry out and cause problems. I had parked the truck for a year or so back on the farm with both tanks empty. No doubt part of the problem.
I'll update you guys when I get something done. Hopefully sooner than later.
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Cargo Master
Joined: Apr 2003
Posts: 2,408
Likes: 6
From: Parkesburg PA
a special tool to de-pressurize the fuel system...
I asked a Ford mechanic about this, he said the number cross referenced to a bucket
The fuel line tools are available from pep boys, autozone and the like. They are called high pressure fuel line disconect tools or something like that.
I asked a Ford mechanic about this, he said the number cross referenced to a bucket
The fuel line tools are available from pep boys, autozone and the like. They are called high pressure fuel line disconect tools or something like that.
Logistics Pro
Joined: Jan 2002
Posts: 3,739
Likes: 3
From: GANS
Actually the easiest way to depressurize the fuel system is to pull the fuse for the fuel pumps when the truck is running.
It sounds like the HP pump has to work harder because the in-tank pumps aren't pumping enough, or perhaps neither of them are pumping because a relay/fuse is blown.
It sounds like the HP pump has to work harder because the in-tank pumps aren't pumping enough, or perhaps neither of them are pumping because a relay/fuse is blown.
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