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Old 09-19-2010, 12:37 PM   #9
68 TT
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Join Date: Jul 2009
Location: Spokane, WA
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Re: 87 TBI to Carb conversion

Quote:
Originally Posted by cyberpine View Post
The fuel pump, filter, tank and gas were all replaced. Fuel pressure is fine, but we did have rust in tank at one point. Mechanic pulled up the TBI and says injectors are shooting smooth and consistent.
How did they check the fuel pressure? You do not have a test port. You need to add a gauge fitting to the supply line next to the TBI unit and connect a test gauge to it. Put the test gauge on the cowl panel where you can see it while driving. I taped mine to the windshield. Do not put it inside the truck whatever you do.

As RF stated the pump may be fine when cold and first started but may lose pressure when it warms up. I have had two do this to me. I was able to see the pressure drop once the pump warmed up.
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