1992 Chevy S-10 fuel pump

1992 CHEVROLET S-10
170,000 MILES • 6 CYL • 4WD • MANUAL
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JDWAPITI
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  • 1 POST
I replaced the fuel pump relay , fuel pump, and sending unit. the fuse are good and their power
to the fuse box ,on the sending unit i get power
to the purple wire none to the gray wire. Is there
a secondary oil pressere switch thats tied into the
fuel pump relay. and Do you have any suggestions
on what to look for to get this thing going.
Jim
Jan 22, 2008 at 3:46 AM
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RASMATAZ
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  • 75,988 POSTS
The oil pressure closes the switch in the OPSU to power the fuel pump as soon as it starts up. See below


https://images.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_28.gif

Jan 22, 2008 at 4:18 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Inbox :: Message
From: jdwapiti
To: rasmataz
Posted: Wed Jan 23, 2008 12:36 pm
Subject: fuel pump
Thanks for your help and rsponse.
I put in a new opsu but still couldnt get it
going , could something in the engine contol
module causing me problems.
Thanks again Jim


The ECM the only thing it does is energizes the the fuel pump for 2secs.

Check the fuel pressure- if its normal-check the injectors for pulse
Jan 23, 2008 at 4:46 AM
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