help please......
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New User
Joined: Dec 2004
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help please......
Hey, I have a 302 1986 F150 and I was driving it home the other night in the rain and it just died.It has died before when it was hot but only went I was stopped and maybe turning and putting it in gear.I know my manifold exhaust equalizer ..? ......valve has broken and my dual tank solenoid valve quit a while back....it is stuck on the front tank.It has ran fine except for the occasional sputtering under a heavy throttle.I put a fuel pressure gauge on it and it shows 40 pounds when a jumper is ran to the DLC.Both pumps can be audibly heard.It seems like the injectors don't seem to fire.Has anyone had this happen to them?
Thanks ,Scott
Thanks ,Scott
Elder User
Joined: Oct 2004
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From: Winnipeg, Manitoba
This is an injected vehical, so it has a high pressure pump, and a low pressure pump as well. The low pressure pumps are located in the tank(someone correct me if I'm wrong please) and the high pressure pump is located on the frame rail(outside of the tanks) The first thing I'd change is the fuel filter, if it still dies after this in extreme hot or cold temps, start looking at the pumps themselves. The next time it does this, twist off the gas cap, and listen for a huge, long hiss. If you get one, likely your pump is on it's way out, or your tank breather valve is plugged up. Tank breather valves allow air in to displace the fuel burnt off, or the tank would "implode" per say. Could be one of several things. I'd also check fuel line routing, especially if this truck has had any previous fuel line/pump work done on it, where the line could simply be running over a hot part of the engine, and be creating a vapour lock. Insulating the fuel lines from the intake manifold and other hot areas of the engine will reduce this in a huge way.
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thanks for the tips!,I am putting on the filter tommorrow and you are right that there are 2 fuel pumps(hi and lo)(actually 3.....2 low ,1 in each tank and one hi).I wasn't aware of the pressure valve ....Thanks again.
Elder User
Joined: Oct 2004
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From: Winnipeg, Manitoba
yup...three if you count both tanks...two in operation at any given time. Pressure regulator keeps it all on a balance to keep the engine from getting to much/not enough fuel at any given time.
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To get back...........my timing chain slipped,the gears were worn out.The indicator was after it died and I tried to restart it ,it turned over really fast and easy(no compression).A compression gauge showed o to 25 # pressure.Slapped a new chain and gear ($15) and it started right away.
Scott
Scott
