87 f-150 fuel problems
10-21-2007, 12:26 PM
#1
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87 f-150 fuel problems
87 F-150 4WD 351HO. Died last thursday, no fuel discharged from the pump
replaced pump and while we were at it we replaced accelerator pump (leaking) and carbuerator filter (bronzelite) where fuel line goes to carb.
Pumb still would not prime. Switched to rear tank and it primed and pumped gas within 30 seconds. We let it run for 1/2 hour no problems and reswitched to front tank and it ran flawlessly for 3 days and then quit again. Switched back to rear tank, primed carb with a little gas and started immediately. Any Ideas what the problem is? Do the fuel tanks have a filter in the pickup? Can they clog we have 160K on truck? IF so how to change filter etc
Thanks for your help PS great site!!!!!!!
replaced pump and while we were at it we replaced accelerator pump (leaking) and carbuerator filter (bronzelite) where fuel line goes to carb.
Pumb still would not prime. Switched to rear tank and it primed and pumped gas within 30 seconds. We let it run for 1/2 hour no problems and reswitched to front tank and it ran flawlessly for 3 days and then quit again. Switched back to rear tank, primed carb with a little gas and started immediately. Any Ideas what the problem is? Do the fuel tanks have a filter in the pickup? Can they clog we have 160K on truck? IF so how to change filter etc
Thanks for your help PS great site!!!!!!!
10-21-2007, 12:53 PM
#2
Senior Member
Most tanks I'm familiar with have a coarse screen over the inlet to prevent material from being picked up - rust, dirt, etc. Can't remember if this was in place on older, carbureted vehicles.
Before you go to the effort of going into the tank, I suggest to first inspect the fuel and vapor return lines for any pinching or kinks, particularly those specific to the front tank.
Since it takes a while for the problem to appear on the front tank, I'm leaning towards a venting problem, or at least eliminating that as a suspect first - ensure that a vented gas cap is used if required.
When gas leaves the tank, air needs to enter via some means, or else a point is reached where the pump can't overcome the vacuum.
Before you go to the effort of going into the tank, I suggest to first inspect the fuel and vapor return lines for any pinching or kinks, particularly those specific to the front tank.
Since it takes a while for the problem to appear on the front tank, I'm leaning towards a venting problem, or at least eliminating that as a suspect first - ensure that a vented gas cap is used if required.
When gas leaves the tank, air needs to enter via some means, or else a point is reached where the pump can't overcome the vacuum.
10-23-2007, 12:59 AM
#6
Beer Drinker
Welcome in. Sounds like some type of venting or vapor locking problem to be too.