Wont start after replacing fuel pump!!!HELP!!!

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Jan 22, 2002 | 04:08 PM

kochy54

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Wont start after replacing fuel pump!!!HELP!!!

I've got a 84 f150 351W 4b. Last week went out to start it wouldnt start. Found the fuel pump to be bad, i replaced it started up let it run for 4 or 5 minutes shut off started again thought i had it licked.
Put away my tools and went to take it for a drive,no start. I've checked and tryed everything I know dang thing has me stumped! It is getting fuel and spark and has compression but will not fire i'm lost.

Any advice or help would be greatly appreciated!

When checking the timing it appears to have 2 marks on the damper one with the degree #'s then one just a straight line wich one do i go by.
Also the engine timing tab has an arrow then a circle which one is used.

Many Thanks in Advance!!!!!!!!!!!!
Carl

Jan 22, 2002 | 05:22 PM

Franklin2

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From: Virginia

Wont start after replacing fuel pump!!!HELP!!!

Pull a plug and see if it is wet. While it is cranking, is fuel dumping into the carb throat without pushing on the thottle? I am working on a theory that maybe when you replaced the fuel pump, a little chunk of rubber hose or trash got up in the float needle and is maybe flooding the engine. Other than this, I would double check again if you have spark and push on the throttle while looking down the carb to see if you have fuel.

Jan 22, 2002 | 06:50 PM

onestep

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From: Plymouth US

Wont start after replacing fuel pump!!!HELP!!!

To much fuel pressure with the new fuel pump?
It could be pushing a weak float needle open and flooding the engine.
Some thing to look at. When was the last time the carb was rebuilt?

Jan 22, 2002 | 07:24 PM

kochy54

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Wont start after replacing fuel pump!!!HELP!!!

Thanks, Franklin2 and Onestep! I am going to pull the carb and see what i can find. I have pulled all the plugs and they didnt seem overly wet to me but i do smell a lot of gas and when i pull the throttle the carb does seem to fill up pretty good. I am positive it is getting spark.

With the two of you telling me it may be a flooding problem i'm going
to try that route, with the number of posts i see you have looks like you are very knowledgable, plus i am out of other options to try (LOL).
Many Many Thanks !
Carl

Jan 25, 2002 | 12:41 AM

Greywolf

Fleet Owner

Joined: Aug 2001

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From: Drummonds, TN USA

Wont start after replacing fuel pump!!!HELP!!!

You might not have to pull the carb, but it's safer that way.

Any time you have the carb off the motor, you should be extremely carefull not to let anything get into the intake runners...
I always stuff rags into the opening to make sure.

The two things you want to look at are not just the needle and seat, but the float itself. As long as you're in there, it's a good time to make sure that it really does float...

And avoid using any sealant on the gaskets, believe it or not. Gasket seal has been known to get into the jets especially if silicon sealant is used. And it doesn't take very much to ruin your whole day.

-Just a few passing notes I thought I'd share...

Jan 27, 2002 | 12:30 PM

rocky2

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Wont start after replacing fuel pump!!!HELP!!!

Under severe flooding conditions the plugs have to come out and heated up with a torch or just replaced.By the way A/c plugs are NO GOOD!!!....I run autolites or Champions in Fords.