Loss of Power

[BiggMike]

I have a 69 F250 with a 360 and it loses power once you get up to 50 - 55 MPH. I have replaced the coil, points, plugs, and put a carb kit in. It is acting like it is losing fuel. I can release the accelarator and gently push it and maintain speed at 50 MPH but if I try and go faster it loses power.

Here are the specks on the truck
1969 F250
360
2100 Carb
Auto
Manual Steering & Brakes

Any help would be helpful.

Mike

[BiggMike]

I forgot to say that I just got the ttruck too, and it has done it since I got it.

[thebannister8]

what do you mean by loses power....cuts out..stumbles or feels like it being held back..

[BiggMike]

It struggles to stay running. It has a manual choke and I have tried to choke it to see if that would help and it doesn't.

[The Good Humor Man]

I would check your vacuum lines, especially the one to your distributor for your vacuum advance.

[BiggMike]

did that but will double check again in the morning. Thanks.

[fordman]

check the vacuum advance itself also. you have to provide it with a vacuum source to see if it operates. sucking air through the line can make it move.

[BiggMike]

Will do thanks.

[The Good Humor Man]

I would also check around your carb for leaks. You can spray some carb cleaner, around the outside, and base, and if you hear it rev up you have a leak.

[BiggMike]

Double checked all vacuum lines and made sure the vacuum advance was working. Found a section of fuel line under the cab that was pinched and changed that to no such luck. Also tried the carb off my 72 F250 and it didn't help. Planning on draining and pulling the tank tommorrow to see if there is any thing in there and will also blow out the lines.

[JEF199]

If you pull the choke out a little at a time while it's messing up and it dosen't help or hurt it then check the fuel presure. I just had a simular problem and I found that it had a pin hole in metal fuel line right where the rubber fuel line goes on.

[BiggMike]

Well I think I finally got the problem fixed. Not sure what it was but tuesday I drained the tank, blew air through the line from the fuel pump to the tank, removed the sending unit to inspect the inside of the tank and seen nothing stopping the flow, replaced the line from the pump to the carb, changed the plug wires, cap & rotor. Drove it today and had no problems at all. Now I just hope I can get the exhaust manifold bolts out without snaping them to replace the gasket. I just purchased the truck last week and getting all the bugs fixed before I put the body & motor on my 72 4X4 frame.