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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.

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Old 03-15-2005, 12:06 AM   #1
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Join Date: Apr 2004
Location: Calgary, AB
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Car: 89 GTA
Engine: 5.7L

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lg4 to L98, desperately need fuel pump help

after hours of seraching im just getting angry

i have a mechanical fuel pump in an 87 lg4.
i hear that i also have an electric pump in my tank?
when i drop the L98 in, i was going to go with an inline pump,
ppl are saying that ill have to drop the tank anyway to get the old pump and i might as well get an intank pump.

i wont drop the tank unless i have to, i dont mind. but the ease of an inline is music to my ears.

i know ill need new lines and a fuel filter to route on the drivers side. but is a line there for an inline pump and will it be a problem getting power to it, relays, fuses etc.

other than the computer and wiring and bolting the L98 to a t-5 and not an auto (supposeably i have to custom burn the prom) this is another confusing issue.

any input would definately be helpful
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87 Z28 5.0HO, 89 GTA L98 WS6, 87 SC
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Old 03-19-2005, 12:45 PM   #2
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If you have a pump in the tank (even a low pressure variety), you could feasibly install a pump inline to feed the TPI. It can be mounted anywhere convenient. Bosch had several inline pumps that would feed the CIS and CIS-E systems at over 75 PSIG. They did require an external accumulator, however.
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Old 03-19-2005, 12:45 PM
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