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Feul pump only runs when jumped, Turns over, Won't Start,

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1 year 10 months ago #56920 by Limu
Aloha,

STOCK 94 Toyota Pickup 2.5 base 22RE 5 speed

No codes or check engine light with ign in on position

New fuel tank and pump assembly

Replaced 2 relays, at $9 ea made in Tatwan on e bay still won't start.

Fuel pump only runs when jumped Turns over won't start
Tested computer had 8 bad capacitors replaced them still no start.
Tested new relays, they open close, Relay once powered on, the 3 other terminals have 12v.
Used test light not meter had power and ground at pigtail to relay, jumped Wh/ Red with Blue pump runs.

Spark for all 4 cylinders is good, use inline test light on spark wires, again no meter

Sprayed starting fluid it wanted to run.:)

Pulled return fuel hose to tank, about a cup of fuel in 8 seconds with pump jumped and key on. Remember pump dose not run with key on.

New complete Timing kit about 20,000 mi ago.

Next step need to hot wire pump direct then try start.

ANY OTHER IDEA"S PLEASE AND THANK YOU

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1 year 10 months ago #56923 by Hardtopdr2
Check your wiring diagrams to see what is upstream of fuel pump relay (ie asd relay, fuse etc) also check diagrams at pcm pinouts for a fuel pump control wire and back probe it to see if your getting voltage or a grounded circuit (which is what it should be for 30 seconds after key is turned to on position but double check the diagrams to be certain) a incandescent test light hooked to batt pos probed into that wire should light when key is turned on for 30 seconds if not hook it to batt negative to see if pump will run if it does your pcm repair will need to be gone over again to see if one of the capacitors is backwards or bad.

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