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sending unit problem

This is a discussion on sending unit problem within the Internal Engine forums, part of the LSx Technical Help Section category; allright...two questions. what fuel pressure should i see, and is a little fluxuation normall? second, i just installed the sandwich ...

  1. #21
    ls1 powered seabee sutie's Avatar
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    allright...two questions. what fuel pressure should i see, and is a little fluxuation normall? second, i just installed the sandwich adapter and ran everything for the oil pressure guage, went fine, turned the car on, read a good pressure for a few seconds, and then started going nuts, jumping all over the place and ultimatly ending up at zero. the sending unit i have only has one port, is it possible its not grounded right and i should buy a two prong sending unit? oh, and i got the stock guage hooked back up but the needle is staying at 60.....

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    Veteran Hi-Po's Avatar
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    Quote Originally Posted by sutie View Post
    allright...two questions. what fuel pressure should i see, and is a little fluxuation normall? second, i just installed the sandwich adapter and ran everything for the oil pressure guage, went fine, turned the car on, read a good pressure for a few seconds, and then started going nuts, jumping all over the place and ultimatly ending up at zero. the sending unit i have only has one port, is it possible its not grounded right and i should buy a two prong sending unit? oh, and i got the stock guage hooked back up but the needle is staying at 60.....
    58 PSI. I see 60 PSI at idle, 53 at WOT, 50 PSI at key on engine off.

    I see zero fluctuation at idle/driving.

    I dont know about your last question. Im not understanding, wher did you ground it at? Is it a known good ground? Your stock gauge isnt working at all now? Just staying at 60 PSI? Doesnt ever move?

  3. #23
    ls1 powered seabee sutie's Avatar
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    allright, well i guess the digital guage is working how it should then. and i just think the stock guage aint very accurate. it stays at 60 with very little movement. and with key on engine off, my digital guage stays at zero. normall?

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