holly 850

[shredwest]

i have a 78 bronco with a 460. it flies up the hill but craps out near the top,when i let off the gas it returns to idle.it seems fine on the flats. the holly 850 has two float bowls,does that mean it is a double pump? any ideas would be great

 

[Leadsled]

Sounds like gravity is happening!! How steep of a hill are you talking about?

 

[BroncoJoe19]

i have a 78 bronco with a 460. it flies up the hill but craps out near the top,when i let off the gas it returns to idle.it seems fine on the flats. the holly 850 has two float bowls,does that mean it is a double pump? any ideas would be great

Didn't the early broncos have some kind of fuel reservoir in the fuel line so that they could manuver on steep inclines?

 

[shredwest]

it,s definately a steep hill in a sand pit but clearly doable.as far as the fuel reservoir in the fuel line, i haven't heard of that but will try and investigate

 

[Crude dude]

You need to install a rubber line from one bowl vent to the next and make a hole in the highest point of the rubber line so that the bowls can breathe. Look at the Holley truck avenger carburetor ( i think thats what its called) to get the idea I am talking about. If you are on a steep incline the fuel is sitting at the back of the front fuel bowl and plugging the bowl vent. It is an old drag racing trick and then Holley made a carburetor with a steel line and vents in it. While you are doing that you also need to get one of the plastic air horn vents that goes inside the bowl. Its a plastic rectangle piece that goes into the rectangle hole in the metering block. You need to drill a very small hole in the top of the metering block and then a small dowel goes in through the top and holds the plastic air horn in place. If your carburetor is tuned right, you will never have a problem on inclines again. Hope this makes sense...good luck.