1985 F-150 Fuel? Problems
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1985 F-150 Fuel? Problems
Hi all,
I was hoping to get some opinions on a problem I am having before I bring it in to the mechanic.
I have a 1985 F-150 with low mileage that has been acting up. It started out as a problem when I was accelerating or making turns. As I would give it gas the engine would start to stall out (flood?) and I would have to push the accelerator very lightly to keep going. I would eventually get up to speed but could not get the truck over around 60-65 mph and the ride was rough. I should mention that this problem seemed to start fairly suddenly and I do not drive this vehicle every ofter (weekly maybe and have only driven a few times since the problem was observed).
I thought maybe the gas was bad so I filled up my second tank and the truck seemed to run great. However, the next time I took the truck out I realized I was using gas so fast I could practically see the gauge going down (ended up around 6 mpg as opposed to my usual 11 mpg). Also, performance was somewhat shaky at first, improving as the truck warmed up, but started to fall apart as I got to about 1/4 tank on the gauge. I filled up the same tank and the peformance did not improve right away, but after about 5 miles and stopping for an errand the truck started up and operated great. However, the gas gauge is once again dropping when I drive.
Not being a mechanic I have postulated that the problem seems fuel pump related. A coworker (and former owner) thought it might be carborateur or tank related. I would appreciate any suggestions .
Thanks, Adam B.
I was hoping to get some opinions on a problem I am having before I bring it in to the mechanic.
I have a 1985 F-150 with low mileage that has been acting up. It started out as a problem when I was accelerating or making turns. As I would give it gas the engine would start to stall out (flood?) and I would have to push the accelerator very lightly to keep going. I would eventually get up to speed but could not get the truck over around 60-65 mph and the ride was rough. I should mention that this problem seemed to start fairly suddenly and I do not drive this vehicle every ofter (weekly maybe and have only driven a few times since the problem was observed).
I thought maybe the gas was bad so I filled up my second tank and the truck seemed to run great. However, the next time I took the truck out I realized I was using gas so fast I could practically see the gauge going down (ended up around 6 mpg as opposed to my usual 11 mpg). Also, performance was somewhat shaky at first, improving as the truck warmed up, but started to fall apart as I got to about 1/4 tank on the gauge. I filled up the same tank and the peformance did not improve right away, but after about 5 miles and stopping for an errand the truck started up and operated great. However, the gas gauge is once again dropping when I drive.
Not being a mechanic I have postulated that the problem seems fuel pump related. A coworker (and former owner) thought it might be carborateur or tank related. I would appreciate any suggestions .
Thanks, Adam B.
Postmaster
Joined: May 2004
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I'm thinking the egr valve is causing it to run rough, and the mileage is bad cause you have to compensate to keep it running. Also, make sure the carb is tightened down tight...it could be leaking air/fuel out...that'll make it run terrible. Spray some WD40 where the intake manifold meets the head when running....if the gasket is leaking it will run crappy....the fluid closes the gap, and the engine smooths out (temporarily).
Good luck.
Good luck.
Senior User
Joined: Nov 2000
Posts: 201
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From: Drayton, ND
I had a mechanical fuel pump in my 84 go bad and cause the exact same symptoms your having. Sometimes might be okay, then it would start to slow down and you would have to feather the gas to maintain any speed. I would start there first.
