Question about 1985 Ford F150

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I have an 85 f150 with a 351 windsor h/o with 4 barrel carb. It starts and runs great. It has always ran a little hot. when i cut it off it won't start back up until its cooled off for about 20-30 mins. It acts like the battery is too weak to start it when its hot but like i said it starts up like normal after it cools. Any Ideas?

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Check your regulator or check out the wiring to the alternator, it could be a connector coming loose or some other problem like a ground. You should also check out all of your motor's ground's and clean them up! I have the same style pickup same motor but mine is a ext. cab. My engine just went out and i bought a 302 and I had the same problem that you have but it's fixed now! I hope I helped you! my email is laredojet@gmail.com Thanks

Posted on Sep 20, 2010

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The starter is probably getting weak and needs to be overhauled or replaced. When it's worn enough it won't turn over a warm engine. Maybe get it checked to be sure but a test will likely show it drawing more power than it should. Engine temperature woulden't affect the battery. Hope this helps.

Posted on Sep 04, 2010

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The intake on your 86 allows exhaust gases to recirculate through the intake for cold weather start ups, you might want to check if the valve is stuck open. Whats happening is it's causing your fuel to boil and causing vapor lock. If you engine is running hot check the pressure cap on the radiator look inside the radiator for debris when it's cool. If those two items check good move on to the thermostat and then water pump.

Posted on Dec 11, 2012

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Electric fuel pump most likely has too much pressure for the carb. AFAIK, the Holley 4150/60 & 4165/75 should each demand the usual 4.7-5.3 PSI (4.7 @ idle, 5.3 @ max RPMs), so even the Holley red pump would need some restriction from a regulator. If you want this to be adjusted to its best efficiency, you need to have a fuel pressure gauge installed temporarily, if not on the regulator like I have on my Scout II. FWIW, the regulator I have installed is the Mallory 4307M from CenturyPerformance.com, Summitracing.com, Jegs.com, etc.

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A bad Needle & Seat will do this also, or debris stuck between the Needle and the Seat. This is where light tapping on the bowl helps, but it's best to run the fuel out of the bowl a few times and then the volume flow, or quick filling of the bowl, should loosen up the debris.

You also could have set he fuel float too high. What model carb, the ones I mentioned above (AKA Holley Modular Carbs)? If so, then Holley's site has a tech center & instructions on setting the float(s). www.holley.com

Set the floats carefully and slowly/gradually. Make sure the lock screw is always loose enough before turning the adjustment nut. If you strip out the bowl's threads on an older carb, you'll beat hell finding a replacement. 1/12 turn = 1/32" of fuel height IIRC. You set the fuel level, with pump running (wrap a rag around the carb so gas doesn't leak onto the manifold!!!) so the fuel is just starting to dip out of the "peep-hole" in the side of the float. Removal of the peep/seep-hole screw/plug is necessary first. Clockwise rotation of the nut lowers fuel level IIRC and counter raises fuel level. Again, please check their website. Most people get discouraged when dealing with the Holley Modular Carbs, but they are the simplest and the best carbs on the market. Even if 30+ years old.

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Wont start after 6 mos. I changed the spark plug, drained & added fresh gas, checked the fuel filter... Kicks over fine. Ran for 4 seconds, then it died. Always ran & started great before.


With a new plug and fresh gas it should start. Check to make sure there isn't a kill switch turned off or that the gas petcock from the tank to the carb is on.

How did you check the fuel filter? Disconnecting it from the fuel line that goes to the carb is the best way, making sure the gas is turned on under the tank. Bleed off a little gas into a can or something just to make sure the filter isn't plugged.

The last thing I'd do is take off the air filter and spray a little starting fluid in the carb. It may start and run several times if there is old gas in there somewhere. Remember the bowl on the carb is probably still full of old gas. After some fresh fuel reaches the plug it should start and continue to run.

(You might drain the bowl on the carb of ols gas before you go any further)

Good luck!

Sirwriter

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