'87 Sputtering From Both Tanks Now
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Freshman User
Joined: Aug 2005
Posts: 45
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From: Long Beach, CA
'87 Sputtering From Both Tanks Now
Hey guys...
A few months ago, my truck started sputtering and dying when I was running it off the front tank.
I switched to using the rear tank. Everything was fine until a few days ago, when it started sputtering and stalling when running the rear tank.
I finally got a chance to take a look today. I pulled the fuel line from the fuel filter, and plenty of gas started shooting out when I turned on the ignition. I replaced the fuel filter for good measure, since I was under the truck any way.
Does this sound like a fuel delivery issue, or should I start looking at something else?
Thanks in advance...
A few months ago, my truck started sputtering and dying when I was running it off the front tank.
I switched to using the rear tank. Everything was fine until a few days ago, when it started sputtering and stalling when running the rear tank.
I finally got a chance to take a look today. I pulled the fuel line from the fuel filter, and plenty of gas started shooting out when I turned on the ignition. I replaced the fuel filter for good measure, since I was under the truck any way.
Does this sound like a fuel delivery issue, or should I start looking at something else?
Thanks in advance...
Posting Guru
Joined: Jun 2007
Posts: 1,394
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From: Des Plaines, Illinois
Pull codes first. fordfuelinjection.com if you need the proceedure. Let us know the codes.
Check the fuel pressure on the rail using the schrader valve. Report back.
Could be a number of reasons, lets see if the computer knows what's up and we'll go from there.
Check the fuel pressure on the rail using the schrader valve. Report back.
Could be a number of reasons, lets see if the computer knows what's up and we'll go from there.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
To pull codes on the 87, you'll need to follow the hookup procedure here EEC IV Self Test hookup because the check engine light is not wired for some reason on 87 model year trucks.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
I would say that since it is happening on both tanks, that the high pressure in-line pump is to blame, but my truck would not run or start when the high pressure pump failed. Definitely check those in-tank pumps to make sure they are working. Also take a look at the wiring connector at the inertia switch under the dash just in front of the brake pedal. That connector melted on my truck and caused an intermittent no-start.
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Freshman User
Joined: Aug 2005
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From: Long Beach, CA
FINALLY pulled the codes
Hey guys...
Finally got a chance to pull the codes. I'm getting 84 with the key on, engine off. And 11 for the continuous memory.
At this point, the truck starts (using the rear tank) but won't run longer than a few seconds.
I changed the EGR Vacuum Solenoid today, still getting the same code.
I checked the voltage coming in, and I'm getting 12 volts.
I don't want to go changing everything else trying to troubleshoot...any ideas where to go next?
Finally got a chance to pull the codes. I'm getting 84 with the key on, engine off. And 11 for the continuous memory.
At this point, the truck starts (using the rear tank) but won't run longer than a few seconds.
I changed the EGR Vacuum Solenoid today, still getting the same code.
I checked the voltage coming in, and I'm getting 12 volts.
I don't want to go changing everything else trying to troubleshoot...any ideas where to go next?
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Elder User
Joined: Jan 2008
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From: N.W. Mo.
You need to know the fuel pressure before you go any farther. Chances are that is where your problem is and if you can confirm that then you have to pinpoint the problem. My guess would be the in tank pumps but guessing isn't the best trouble shooting method.
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From: Maine, Virginia
I would say that since it is happening on both tanks, that the high pressure in-line pump is to blame, but my truck would not run or start when the high pressure pump failed. Definitely check those in-tank pumps to make sure they are working. Also take a look at the wiring connector at the inertia switch under the dash just in front of the brake pedal. That connector melted on my truck and caused an intermittent no-start.
Tim
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Freshman User
Joined: Aug 2005
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From: Long Beach, CA
My progress...
So I got a chance to get under the hood for a couple of hours today.
At the fuel rail, I got 0 psi of fuel pressure. Since I could hear the fuel pump doing it's thing...I decided to check pressure after the fuel filter.
Rear Tank (the one that worked before all this): 40 psi
Front Tank (the one that wasn't working): 20 psi.
So...I figure the in-tank pump in the front tank is dust...but that doesn't matter because I don't drive this beast very far.
So...it seems that at least one tank (plus the high pressure pump) are working OK.
I took a look at the Fuel Pressure Regulator. As soon as I pulled the vacuum hose off...gasoline everywhere.
Bought a new regulator...spent over an hour getting the old one off (upside-down hex nuts...with one out of site...are you kidding me FoMoCo?).
I'll be putting the new one on soon...hope this fixes the problem.
At the fuel rail, I got 0 psi of fuel pressure. Since I could hear the fuel pump doing it's thing...I decided to check pressure after the fuel filter.
Rear Tank (the one that worked before all this): 40 psi
Front Tank (the one that wasn't working): 20 psi.
So...I figure the in-tank pump in the front tank is dust...but that doesn't matter because I don't drive this beast very far.
So...it seems that at least one tank (plus the high pressure pump) are working OK.
I took a look at the Fuel Pressure Regulator. As soon as I pulled the vacuum hose off...gasoline everywhere.
Bought a new regulator...spent over an hour getting the old one off (upside-down hex nuts...with one out of site...are you kidding me FoMoCo?).
I'll be putting the new one on soon...hope this fixes the problem.
