EFI to carb. HELP PLEASE.

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07TBSS

Forum Member
I'm doing a 1998 GMC 1500 4WD motor swap. 305 EFI to 350 carbed. I put a return style fuel pressure regulator on a Weber 600 cfm. I found an ignition hot wire for the HEI and checked all the grounds. The motor runs for about a minute before the fuel pump cuts out. The stock ECU is still hooked up but obviously most of the harness has nothing to plug in to.

Am I going to have to jump the fuel pump to keep it running or can I trick the ECU into keeping the pump going? Also, will I have to hook up the MAP for the EOD trans to shift correctly?


Thanks.
 
07TBSS said:
I'm doing a 1998 GMC 1500 4WD motor swap. 305 EFI to 350 carbed. I put a return style fuel pressure regulator on a Weber 600 cfm. I found an ignition hot wire for the HEI and checked all the grounds. The motor runs for about a minute before the fuel pump cuts out. The stock ECU is still hooked up but obviously most of the harness has nothing to plug in to.

Am I going to have to jump the fuel pump to keep it running or can I trick the ECU into keeping the pump going? Also, will I have to hook up the MAP for the EOD trans to shift correctly?


Thanks.
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Are you keeping the stock PCM to control spark or?? Did you swap in an HEI? The stock dizzy in there is not HEI, that's why I ask.
If you have the stock controller, you must be getting crazy check engine lights..
 
You shouldn't need the ECM at all really. Do like Dave said and wire the relay to come on when the ign key is on.
 
07TBSS said:
What about the ignition? I'm using the hot wire from the stock coil.
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that wire is fine for the distributor, let me look at the wiring tomorrow, but you might just have to ground 1 terminal of the relay, the other might be key on already
 
oh, and you will need to rig up a TPS, and keep a MAP sensor hooked up, then have the PCM tuned to have all the other codes removed, so you can have the trans operate proberly


oh, and it's a 4L60E(not EOD)
 
either find out why the oil pressure switch isn't powering up the fuel pump when the engine isn running, or pull the fuse box under the hood loose, and tie the green/white stripe wire to the fuel pump relay to a key on wire
 
Hook the tach lead on the HEI to the Wh8ite wire on the module plug and ground the Black and Black with Red wire to the engine block. that will con the ECM into beliving the fuel pump should be running.
 
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