Steve89GTA

I'm tired of this damn hesitation problem I'm getting around 1200 - 1900 RPM. Car buckles a bit when taking off normally in second gear. (does a little in 3rd too). Car pulls very strong above this and passed emissions as well. If I run the car hard though, it acts a little strange for the next 10 min or so. Is my fuel pump strugling to keep the pressure up? wouldn't this set a code. I have 178,000KM's (115,000miles?) on this motor, I think I'll have the pump changed anyway. I can get it for $80.00 CDN and the strainer for $24.00. Might change the TPS too (at $60CDN), can't go wrong. IAC is clean, distributor is new along with cap, rotor, wires, plugs, fuel filter, mobil 1 synth oil, bla bla bla what else could it be??

RX-7's are looking really sweet nowadays!

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89 GTA G92
305 TPI WC 5spd w/3.45
Accel Cap & 8mm Taylor's
Custom 4" Cold Air Induction
Jet Airfoil
K&N Airfilter
160 deg stat/fan switch TB Bypass - Steel Rad
Cat back 3" Exhaust w/Terminator Muff.
HiGh FlOw Dynomax Cat
Spohn LCA's - KYB GR-2's
Moroso Crank Bolt and roller pilot bearing.
Autometer Vac+Oil Temp

Vader

Steve,

Instead of going through the hassle of removing the fuel tank and changing the pump, try performing some diagnostic first to see if the current pump is good or not. Test teh fuel pressure. It should be at 37 PSIG +/- 3 PSIG at idle with the vacuum line connected, and should rise about 5-6 PSI with the vacuum disconnected.

Remove the fuel line and test the flow capacity of the pump. The pump should be able to pump at least one pint in fifteen seconds, which is more than enough to feed an engine with 34PH injectors at WOT. Your 19 or 22 PPH injectors will certainly survive with that flow.

If the pressure and/or flow are inadequate, make sure the fuel filter is clean. It would be more than a little annoying to replace teh fuel pump and in-tank strainer only to find the fuel filter or pressure regulator is fragged, and was probably causing all your problems.

I have several EFI engines, and 180,000 MILES (not kM) and fifteen years of service on the oldest one hasn't killed them yet. Just because it's old doesn't mean it isn't good

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Later,
Vader
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