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Old 11-10-2005, 05:47 PM
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late model engie swap nightmare

I have installed a late model 350sbc and a700r4 in a 1966 Impala station wagon. The engine has vortec heads,a GM performance throttle body intake,headers I believe it is otherwise stock. I put a frame mounted electric fuel pump for a 85/86 ford p/u I have tried to start the car with no luck. I can get it to barely run/idle only if I pinch the return line off. The manual I have for my 92 roadmaster wagon says with the key on but engine not running it should show between 9 and 13 pounds of fuel pressure. I put a Holly fuel pressure gauge inline turned the key to the on position and it only shows about 2lbs about 5/6lbs if I pinch the return line. Cranking the car it shows about 20LBS, but when I stop cranking but leave the key in the on position the gauge drops back to 2lbs in only a few seconds. I hope someone can help me with this while I still have some hair.


Last edited by unclehotrod; 11-11-2005 at 10:12 PM.
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Old 11-10-2005, 07:02 PM's Avatar
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What have you installed this combo in (year/body). Most of the throttle body GM cars I have messed with need considerably more fuel pressure than 20 lbs.
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Old 11-10-2005, 07:20 PM
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Doc here,

Try a non vented Fuel cap...

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Old 11-10-2005, 08:38 PM
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GM Tbi needs 9 to 13 fuel psi to operate properly.
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Old 11-11-2005, 09:43 AM
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The Ford fuel pump is your problem... Low pressure output for a carb application. Carbs rarely need more then 5 or 6 lbs. You need to put the correct pump in the tank or at least a high pressure remote pump.
Is this install in the '92 wagon? These cars were fuel injected so what is wrong with the current pump? it should provide the correct pressure if it is working correctly.
Really need some more info on the swap.
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Old 11-11-2005, 01:24 PM
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The Ford fuel pump is your problem
No doubt!! Jeeez, a ford pump on a chevy?! They must be fightin'!!

But really, I'd look for an aftermarket pump, and an adjustable regulator. This way you could have precisely the fuel you would need, and avoid all the messy ford/chev discussions.....
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