Question about 1985 Ford F150

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Why does my carburetor only run when I prime it?

Replaced mechanical fuel pump, rebuilt the carb, still wont run for more than 2 or 3 minutes. Getting no fuel up to the carburetor. Its a 4 barrel holley with a 351 Windsor h.o.... I am at a standstill with this! Please help!

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You will have to remove the mechanical pump and prime it before it will pump fuel. Quickest way if you can put your hands in fuel is to put the pump in a bucket of fuel and work the lever. It will only take a few pumps of the lever to get fuel into the pump. If fuel affects your skin then attach a hose to the inlet side and work the lever. Then when you refit the pump ,make sure that the lever is on the correct side of the cam. After that you will have fuel in the carby fairly quickly (30 secs of cranking or less)

Posted on Nov 19, 2014

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The fuel pump, even though it;s new, could be defective. Try to return it to the place where you bought it. If all the fuel lines and fuel filter is open, then it probably is the pump. Have you checked the float valve in the carb?

Posted on Nov 30, 2014

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If replacing the inline fuel filter doesn't do it, I'd say drop the tank and clean it out, after you remove most of the gas of course. easily done on your truck. this is assuming you correctly installed the pump after priming as Bill Boyd suggested

Posted on Nov 19, 2014

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Man there is also an inline fuel filter you might wanna replace if you didn't when new pump went on

Posted on Nov 19, 2014

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There is a filter in tank called a sock, it can be removed without pulling tank by blowing back from fuel pump, with compressed air, don't forget to remove gas cap to let air out.

Posted on Nov 19, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 30 Answers

SOURCE: 1973 Mustang carburetor replacement.

it would be easier to buy the adapter but holley al;so makes intake manifold for this problem they are pricey but you get the full 600cfms with an adapter you wont get as much oomph out of it but and adapter is a good idea especially when you dont have 300 to blow on the manifold

Posted on Oct 02, 2009

AmerIHCan
  • 14 Answers

SOURCE: i have a 1984-85 holley 4 barrel and it has

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.

http://www.malloryperformance.com/pdf/4307M.pdf

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.

Posted on Apr 15, 2010

Testimonial: "ty very much..i wil try to adjust "

mcdevito75
  • 1970 Answers

SOURCE: looking for a diagram of a single barrel holley carburetor

mcdevito75 here, A repair manual at your local library could have the diagram.

Posted on Jun 17, 2010

frankgilbert
  • 613 Answers

SOURCE: 1984 f-150 inline 6, 1

I need to ask a few questions and please do not think I am insulting you.
How much gas is in tank?
Is the gas good gas and not with water in it? Can you take any gas from the hose into a clear container and wait a minute and see if separation occurs?
Can you see gas squirt into carburetor when you pull on the accelerator cable or push the lever in on the carb? If you can see it..it is going into the intake and .most likely bad gas.
Lastly and another problem area is the fuel jet inside the carb is stuck or has an obstruction such as goo from bad gas?
This gives you some ideas on what to look for and thanks for using FixYa.

Posted on Jan 24, 2011

mabpest
  • 1152 Answers

SOURCE: I need a vacuum hose

you can go to autozone web site and register your VIN # and click repair tab and find all the drawings there..its free

Posted on Jan 26, 2011

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