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Dave Gantz · 11-28-2015, 01:56 PM

If it ran okay at some point in the past, you might want to check for a vacuum leak, as previously mentioned, by either slowly closing the choke flap or covering the air horn with a rag and see if it smooths out. If it does, you can use propane (Unlit!) to try to determine where it's leaking. Don't forget to check the brake booster, if any.

If no leak, pour some Seafoam (I've had success with this product on small engines.) or other gas additive, in a heavy dose in the tank. Drive it a while. A vehicle that doesn't get driven much may have some build-up of crud in the carb.
A carb rebuild may be necessary if it is crud and Seafood doesn't get it clean.

11-28-2015, 01:56 PM	#5
Dave Gantz Senior Member Join Date: Nov 2005 Location: Verrry South Jersey Posts: 537 Likes: 134 Liked 251 Times in 125 Posts	Re: Street Rod fuel question If it ran okay at some point in the past, you might want to check for a vacuum leak, as previously mentioned, by either slowly closing the choke flap or covering the air horn with a rag and see if it smooths out. If it does, you can use propane (Unlit!) to try to determine where it's leaking. Don't forget to check the brake booster, if any. If no leak, pour some Seafoam (I've had success with this product on small engines.) or other gas additive, in a heavy dose in the tank. Drive it a while. A vehicle that doesn't get driven much may have some build-up of crud in the carb. A carb rebuild may be necessary if it is crud and Seafood doesn't get it clean.