Question about 1987 Ford F 250

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Hello, After my 1987 F-250, 7.5 L V-8, 4BBL sits for more than 12 hours I have to pump the accelerator anywhere from 20 to 50 times to get it to start. Once it starts it runs fine. I have replaced every tune up part I can. Runs even better... :) Just doesn't start quickly. Help! Thanks

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That would be a Holley, probably model 4160 carb on it. You need to do a little detective work on this. You either need to adjust the choke or find out where the fuel is going after 12 hours.

First, when the engine is running check the Intake and Carburetor gaskets for vacuum leaks. Also spray by the Vacuum reserve canister (Like a coffee can) with either Choke cleaner or a water mist. Either way the RPM will change if you have a Vacuum leak. Fix the vacuum leak if you find one. The engine needs Vacuum to draw in the fuel for a cold start. There are vacuum ports with gaskets (Hidden until disassembled) where the Choke housing attaches to the main block of the Carburetor. A leak here will mess up the tiny piston inside the Choke. (Its under the Black cover and operates the stepup for cold starts).

The black choke dial should be set for 2 marks rich. You should not need excess force on the choke flap to unload it. The choke flap should maintain an opening about 2 credit cards thick measured between flap and carb housing. To get this space you bend the rod pushing the choke flap. This should help the choke work better.

If this does not help, on the next 12 hour interval check for fuel by taking off the strainer on the Carb inlet and remove the line from the carb to the pump. If the fuel line is dry you are losing the Prime to the pump. You must have either a bad pump or a hole in the fuel line from the tank.

Would like to know what you found. The Power pump inside the front bowl of your Holley has a number and you can go to a Holley website to see if it is correct for your truck. The fuel inside the front bowl of your Holley should be enough start the truck. Even if the bowl went dry overnight, the fuel pump would replenish the supply well before 20 to 50 pumps.

Posted on Nov 04, 2010

Testimonial: "Although I haven't tried any of the things suggested yet, I am very appreciative of the incredible detail and advice given. Thanks!"

  • rdsiv Nov 04, 2010

    Thank you! This is the best advice I've had for this problem yet. I will let you know when I find out what is going on. Most guys at work told me it was the Accelerator Diaphram allowing the bowl to empty... but I see by your advice that this isn't always the case. It will be awhile before I get to this but I will certainly be back in touch!

  • fordexpert Nov 05, 2010

    You can try the Pump Diaphram if you want. Its easy to replace. If the Diaphram was leaking you should change the oil. The excess gas would run through the Carb bowl and down the cylinders past the rings and into your oil pan. The Choke setup should be looked at anyway.

    I have a 1988 460 /340HP in my boat. It takes no time at all for the fuel pump to refill the front bowl. There is also gas in the rear bowl that feeds the rear 2 Barrels. That gas comes from the front tube off the front bowl. Remember to check the strainer screen in the front gas Inlet.

    Thanks for your comments.



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