No Fuel Pump Prime, Solid Cell, Fuse 24 Blowing, no signal on fuse 18 (fuse appears to be good.) Fuse 31 (ECU underhood = good)

Using 6-12v test light. Car is a 93 si with b16 swap. Not sure what i should check next? Any help would be greatly appreciated.

 

(Test #1) Unplug the main relay. Measure the resistance to body ground at terminal 7 (Yel/Grn wire) of the main relay connector. Post the Ohm reading.

 

grounded to chassis and measuring from thick yellow/green which i believe is number 7 (does 6 have to separate green/yellow wires running to it?) ohm reading from 7 was 00.6.

 

The Yel/Grn wire or the fuel pump has a short. (Test #2) Unplug the fuel pump connector, and then repeat the same Ohm test (Test #1) you did above on main relay terminal 7. If the resistance now jumps way up (no continuity to body ground), then the fuel pump is almost surely shorting out and needs to be replaced.

 

i ran the ground wire to terminal 7 of main relay and ran red wire to yellow/green of fuel pump connector resulting in 0.00 displayed. i recently swapped from a walboro 255hp back to my old, stock fuel pump (worked before removing). should i remove the pump? any way of testing it?

 

excuse my inexperience with the multimeter, but this last step did not require the ignition to be switched to on, correct?

 

I don't understand this test. Please explain.

Do Test #2 that I mentioned above.

 

sorry, i thought i was to test continuity between terminal 7 of the MR and the fuel pump connector. i will try from the fuel pump connector to chassis ground with ignition switched on or is it because we are only testing resistance that the car does not need to be switched to on? thanks.

 

The car should be turned off for Test #1 and #2 (see above).

You have a short in the circuit, so in Tests #1 and #2 you are measuring resistance to ground not end-to-end resistance of the fuel pump wire.

 

i went back and plugged red wired to green/yellow wire in fuel pump connector, black wire to chassis and multimeter stayed at 1.

 

I assume you don't mean 1 Ohm but off scale high resistance, right? Now do Test #2.

 

i went back and did both tests using the same ground this time (main middle support behind dash) with multimeter set at 200k, and connecting red lead to terminal 7 of main relay, with ignition off, i had a reading of 0.00. using the same ground i connected the red lead to yellow/green wire of fuel pump connector and had a reading of 0.00.

 

Both test #1 and #2 I described are done from the main relay connector. Redo both tests with the multimeter set on the lowest Ohm scale, such as 20 Ohms or 200 Ohms. (The 200K (20,000) Ohm scale is too high to get a useful reading). On the lowest scale, also post the Ohm reading you get by touching the two meter probes together. Also redo your fuel connector test with the multimeter set on the lowest Ohm scale.

 

sorry reading comprehension got me there.

i readjusted the multimeter to be on 200 now, and not 200k

connecting both the red and black leads together = 00.3
red lead to main relay terminal 7 and black lead to chassis ground (fuel pump connector still connected)= 00.4
red lead to main relay terminal 7 and black lead to chassis ground (fuel pump connector disconnected from fuel pump) = remained at 1 (no change on display)

 

If you get an about 0.4 Ohm reading from the Yel/Grn wire terminal in the unplugged fuel pump connector, then replace the fuel pump.