is there any way i can just disable the in-tank pump and put a mechanical one on??

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beau-t-ful yellow 85 iroc

 

You can disable the in-tank pump, but there's no mechanical pump that I know of, that'll provide the 40 to 50 PSI your car needs (if it's TPI).

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IROC-Zone
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'88 Camaro IROC-Z 350 TPI
'98 Grand Prix GTP 3.8L SC

"Yea, though I walk through the valley of rice,
I shall fear no Turbo; for Torque art with me."
- Cullan Hooley

 

To disable the in-tank pump you have to unhook the fuel pump relay and take out the fuel pump fuses! You also MUST disconnect the oil pressure switch and hook up a mechanical oil pressure gauge!! The in-tank fuel pump runs off the oil pressure switch (as my friend found out when he tried disabling his in-tank pump)!! Also, Allan is right, if you have TPI you have to use the in-tank pump because they don't currently make a mechanical fuel pump that provides enough pressure for TPI!!(Might supply enough for ONE injector on a TPI setup...LOL) :-)

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1986 Trans AM
305 TPI
Completely Stock
Soon to upgrade to a 327 TPI with pocket ported 64CC heads, comp cam, TPI air foil, Adjustable Fuel Pressure Regulator, possibly bigger injectors!
Current project: Keeping my car running until I get the money for the above mentioned project! :-)

 

Pat,

You can abaondon the in-tank pump and install an in-line electric pump to deliver more fuel at higher pressure. As long as the check valves in the original pump are not stuck closed, the new pump should work fine. Mallory makes a decent unit (P/N Comp-110FI) that will deliver 110 GPH at 60 PGIG - more than enough for most TPI engines. BBK makes one that will do 70 PSIG and is designed to mount in-line, under the car. Either of these are about $225.00.

Incidentally, the oil pressure sensor that operates the fuel pump is a separate sensor from the one used for the dash instrument (at least it is on MY '86 TA/TPI). You can disconnect the original pump right near the tank and use the same wiring to control the replacement inline pump.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

[This message has been edited by Vader (edited December 29, 2000).]

 

so, i can disconnect the fuses and relay, and then just hook up the in-line pump without taking out the gas tank??

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beau-t-ful yellow 85 iroc