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1992 Chevy S-10 fuel pump

Tiny
JDWAPITI
  • MEMBER
  • 1992 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • MANUAL
  • 170,000 MILES
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
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Tuesday, January 22nd, 2008 AT 11:46 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The oil pressure closes the switch in the OPSU to power the fuel pump as soon as it starts up. See below


http://www.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_28.gif

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Tuesday, January 22nd, 2008 AT 12:18 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 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
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Wednesday, January 23rd, 2008 AT 12:46 PM

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