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OT sort of.. truck carb problem

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Kelly C

11-18-2004 10:10:16

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Where better to go then here?? Having problems with the carb on my beater truck.
1975 F250 V8
This thing has a 2 barrel carb on it.
Starts ok and runs a little rough. Then after about 5 min or so it acts like its starved for gas.

I changed the filter and checked the pump.

I restarted it and it ran ok for about 5 or 10 min just idleing.
I figured must be ok and was going to put some seaFoam in the tank and be done with it.

She started sputtering and getting ready to die. I looked at the carb and gas was coming out every where except the jets.

I assume the float is sticking.. I pulled the cover and it looks ok to me. But what do I know?

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Redmud

11-19-2004 07:00:23

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Re: OT sort of.. truck carb problem in reply to Kelly C, 11-18-2004 10:10:16

Kelly, We may have some parts missing here.
There should be a wire clip that holds the float in place. It clips onto the float shaft, and also onto the needle seat. without this clip the carb will flood. There is the helper spring that helps lift the float. There is a small wire clip that snaps to the butt end of the needle. All three parts must be there, and installed right for this carb to work. Do you have these parts with your carb?
Redmud:

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Kelly C

11-19-2004 18:39:58

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Re: OT sort of.. truck carb problem in reply to Redmud, 11-19-2004 07:00:23

I did not see any helper spring. The wire clip was there.
I picked up a rebuild kit this morning. It is a very complete kit. Even has instuctions. Not bad for $16. Guess what I am doing tomorow?

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Redmud

11-20-2004 07:20:59

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Re: OT sort of.. truck carb problem in reply to Kelly C, 11-19-2004 18:39:58

Kelly, I don't recall the helper spring ever being in a kit. you can do the rebuild without the spring, you may have to lower the float setting but not enough to hurt performance. The only place I know to get the spring is the dealer, or another carb. Good luck with the rebuild.
Redmud:

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Redmud

11-18-2004 17:35:02

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Re: OT sort of.. truck carb problem in reply to Kelly C, 11-18-2004 10:10:16

Kelly, the short end of the spring will go under the float, long end will go against the fuel bowl. you can take an extra wind on the spring before setting the float in place. the spring is there to help lift the float. also make sure there is a gasket under the needle seat.
Redmud:

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Kelly C

11-18-2004 19:25:05

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Re: OT sort of.. truck carb problem in reply to Redmud, 11-18-2004 17:35:02

I think that might be the problem. I dont recall the spring being set so as to have any type of tension on it at all. Looked like it was just there to hold the pin to the float.
I will check that out.

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rustyfarmall

11-18-2004 14:21:36

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Re: OT sort of.. truck carb problem in reply to Kelly C, 11-18-2004 10:10:16

Kelly, I've owned a few of those good old Fords, still got a couple of them. What the others have said is correct, I won't go into any more detail on that, but I do want to add one thing I've found that seems rather strange. It seems these carburetors have a tendency to loosen up where they are mounted to the intake, maybe the gasket shrinks, I don't know, but it will drive you nuts trying to get the engine running smooth, just tighten down those four bolts and it runs like a new one again. The in-line 6s are particularly bad about this, but I've had it happen on the V-8s also.

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Allan in NE

11-18-2004 14:36:35

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Re: OT sort of.. truck carb problem in reply to rustyfarmall, 11-18-2004 14:21:36

Rusty,

How's about those 'warped' manifolds on those old Ford 300s. Betcha ran into a few of those too. :>)

Allan

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Redmud

11-18-2004 11:49:58

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Re: OT sort of.. truck carb problem in reply to Kelly C, 11-18-2004 10:10:16

Kelly, It could be the needle and seat like Allan said. But whatever you do check the power valve. also if you remove the top of the carb, make sure it has the helper spring on the shaft that runs through the end of the float. Lots of the springs get left out in a rebuild, and that type carb needs the helper spring.
Redmud:

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Kelly C

11-18-2004 15:43:08

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Re: OT sort of.. truck carb problem in reply to Redmud, 11-18-2004 11:49:58

Is there a way to have the spring installed wrong?
I pulled the carb and took it apart.
I cleaned out the pasages for the power valve. It seems to operate ok. The rubber on it was fine.

Pulled the seat out and cleaned it up. Cleaned the needle up.

Its leaking past the gasket of the 2 halfs of the carb.
The guy that was selling the truck said he put a carb kit in there he must have messed some thing up.
Wish I could find my old Chilton book.

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Redmud

11-18-2004 11:11:47

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Re: OT sort of.. truck carb problem in reply to Kelly C, 11-18-2004 10:10:16

Kelly, those carbs use a power valve if I remember right. It's under the fuel bowl, has a cover with 4 screws. Looks a lot like the pump cover. it is operated by vacuum. some get the vacuum by a hose. others from a port under the cover. if yours has a hose going to the cover, just pull the hose off and see if the engine runs OK. if no hose, then you will need to pull the carb. if there is gas in the cover then the power valve is bad. If the valve is bad, gas will run out of the bowl into the intake.
Redmud:

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Kelly C

11-18-2004 11:26:03

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Re: OT sort of.. truck carb problem in reply to Redmud, 11-18-2004 11:11:47

That sounds like what is happening.
There is a LOT of gas coming out.

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Allan in NE

11-18-2004 10:27:09

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Re: OT sort of.. truck carb problem in reply to Kelly C, 11-18-2004 10:10:16

Kelly,

Is that one a Holley?

You probably knocked a piece of crud loose when you changed the filter. Plug the fuel line off, start 'er up and run it dry, Then reattach your fuel line to see if it does it again or if it will flush on thru.

If it floods again, you might have to stick a needle/seat in 'er.

Allan

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Kelly C

11-18-2004 10:36:29

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Re: OT sort of.. truck carb problem in reply to Allan in NE, 11-18-2004 10:27:09

Motor craft. D4TE JA

It did it befor I changed the filter also.
But yea I suppose.
I figured I would just swap out a used carb... Yea right thats like finding a needle in the hay stack.
Maybe I can get the carb off my 460 on her.....hehehe

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catmandoo62

11-18-2004 17:09:57

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Re: OT sort of.. truck carb problem in reply to Kelly C, 11-18-2004 10:36:29

hows the float,they tend to soak up gas thru the years

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Ron in Nebr

11-18-2004 10:48:41

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Re: OT sort of.. truck carb problem in reply to Kelly C, 11-18-2004 10:36:29

Motorcraft carbs are quite similar to some of the Holleys. Like Allan said, you probably just had something come through and get stuck in the needle and seat. Follow his advice and more than likely it'll be just fine. Good luck!

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