fuel restriction?

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Apr 22, 2005 | 02:26 PM

robs70vette

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Heel & Toe

Joined: Mar 2003

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From: Pennsburg PA

fuel restriction?

Boy have I got what may be a real newbie question. I've got a 350 with moderate work (bored .030, aluminum heads, Air gap intake, Lunati cam, Holey 650cfm carb). When I go to full throttle, the carb seems to bog down (that's just my observation, it may be completely off). Is it timing related, accelerator pump related or something else? Along that line, when I do get chugging, say cruising at 80 MPH, the car will start to buck as though it can't get enough gas...
Any clues?

Apr 22, 2005 | 03:43 PM

bobs77vet

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Joined: Sep 2004

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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod

Quote:

Originally Posted by robs70vette

you may have a fuel starvation problem caused by a clogged fuel filter or poorly performing fuel pump

Apr 22, 2005 | 03:53 PM

robs70vette

Thread Starter

Heel & Toe

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From: Pennsburg PA

If it is a fuel starvation problem and I'm looking at a replacement, what are the pros and cons of converting to an electronic fuel pump.

Apr 22, 2005 | 08:14 PM

bobs77vet

Race Director

Joined: Sep 2004

Posts: 11,874

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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod

Quote:

Originally Posted by robs70vette

If it is a fuel starvation problem and I'm looking at a replacement, what are the pros and cons of converting to an electronic fuel pump.

I am not an electric fuel pump fan unless you put in an inertia kill switch in case you get in a crash....the old fuel pumps work very well

Apr 22, 2005 | 10:35 PM

wildman378

Melting Slicks

Joined: Apr 2004

Posts: 3,287

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From: n/a SC

I had this same problem it would run fine until you got on it then stumble around was a clogged fuel filter shes runs perfect now!

Apr 23, 2005 | 08:45 AM

robs70vette

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From: Pennsburg PA

I have a glass sight on my filter (less than 500 miles). It shows no signs of dirt or contaminants. Could there be blockage in the rubber lines? If so, how can I check it.

Apr 23, 2005 | 09:55 AM

bobs77vet

Race Director

Joined: Sep 2004

Posts: 11,874

Likes: 263

From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod

Quote:

Originally Posted by robs70vette

I have a glass sight on my filter (less than 500 miles). It shows no signs of dirt or contaminants. Could there be blockage in the rubber lines? If so, how can I check it.

disconnect the glass filter crank enginewith coil grounded and watch,measure and time the amount of fuel it spits out....then compare to specs...(.i'm making this number up ...1 gallon per minute...)