EFI problems, no combustion

uscmas412

SILVER Star
Joined
Apr 19, 2015
Messages
331
Location
Navarre FL
 
Just installed a new OEM fuel pressure regulator, no changes. Still getting 12V at the fuel pump harness while cranking.
 

uscmas412

SILVER Star
Joined
Apr 19, 2015
Messages
331
Location
Navarre FL
 
Ok, I think I did this correctly. Alligator clip and wire from + post on battery to + lead on multimeter. Touched negative multimeter lead to ground point on top of fuel tank and measured 12.8V.

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Joined
Oct 26, 2019
Messages
106
Location
Garden Grove
leave everything connected. Put the Positive lead on the Blue Wire and negative on the ground point on the fuel pump cover. Crank the car, check to see if you see the 12v
 
Joined
Jun 26, 2004
Messages
1,806
Location
east coast Canada
 
 
 
Use a test light for your voltage checks. Volts mean nothing, the test light will measure/show you have voltage when a load is provided. You can have 12 volts but no amp/load ability. I have found many a problem like this and it’s usually a corroded connector that slows no load voltage through, but once load is placed on circuit you get nothing.
 

uscmas412

SILVER Star
Joined
Apr 19, 2015
Messages
331
Location
Navarre FL
 
Thanks for the help guys, I think I solved the issue. I swapped in the original fuel pump relay I kept as a spare and it's cranked every time. The faulty relay I removed was OEM and only three years old, not sure if there's an underlying problem. They both passed the FSM test and clicked when connected to 12V so I assumed the newer one was working properly.
 
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