xsc2003

I am working on a 1992 LS400 with the 4.0 V8. The car came in with a starting problem. It just sits there and spins. I've tried to get the codes but the CEL just blinks 2 times every second, which means theres no codes. I have put a new fuel pump, F/P Relay, EFI Relay, Ohm'd Transmitter, Injectors have power, has spark. All it does is sit there and turn over. I know it isn't getting any fuel and thats why it want start, but I've replaced all that stuff twice now,

The fuel pump isn't even kicking on. I can straight wire the fuel pump and the fuel pump will run. I've also tried to start the car this way and it want run like that. But if you spray ether into the throttle body the car wants to run. I've trace wires for days to look for any cuts, slash's, knicks or anything, and I couldn't find one. I've replace fuses and relays like there going outta style. I dont know anything else to do. Where is the fuseable link? I think I may have found one on the passenger side but I think it is tied in with the ABS.

19psi

since the car doesn't run with the pump hotwired, look at what powers the pump normally. probably a cam or crank signal. i've never diagnosed this particualr problem in an LS, but typically the cam or crank sensor will trigger the fuel pump relay once you crank the engine.
so.....if your engine doens't run iwht teh pump hotwired, that means you still have a problem upstream of the actual fuel system. if you have a service manual, look at what triggers the fuel pump relay. that will be your problem.
in other words, look at why your fuel pump doesn't have power when you crank the engine. trace that circuit back.

python

iTrader: (4)

if it were a cam or crank sensor problem i would think there would be a code stored, also, u start at the fuel pump and work ur way forward, if u dont have power to the pump, why did u replace it? the next point of power is probably the relay, check power in and out, find the wire that supplies power to the pump from the relay and see if its hot either with the key in the run position or while u crank it over