Help! Fuel pump Question

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Dec 28, 2014 | 10:18 PM

#16

omni

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sorry don't want to use up your evening, How do I check the ground, Thanks

Dec 28, 2014 | 10:22 PM

#17

JWC 3

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From: Tennessee

Easy . With your test lamp in series with the pump wiring . One end to the ground , one to the hot wire . Cycle the key . Test lamp should light . If you own and know how to use a DVOM , that would be better yet .

Dec 28, 2014 | 10:28 PM

#18

omni

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thanks. I'm assuming ground is black, could I screw something up if I hook it up wrong?

Dec 28, 2014 | 10:34 PM

#19

JWC 3

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From: Tennessee

Not with a test lamp . It is just a light bulb . It does not care which end gets power or ground . It will light either way .

Dec 28, 2014 | 10:36 PM

#20

omni

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Its a four prong plug, could I hook power up to the wrong prong, say power to a non ground wire?

Dec 28, 2014 | 10:43 PM

#21

JWC 3

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From: Tennessee

Then the lamp would not light . ... I ' THINK ' the plug has 2 sizes of wire . The 2 larger wires should be the pump , the smaller ones the sending unit .

Dec 28, 2014 | 10:47 PM

#22

omni

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Does the front and rear tank have the same ground source?

Dec 28, 2014 | 10:49 PM

#23

JWC 3

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From: Tennessee

Not sure without a diagram . Let me see if I can log on to Identifix and find one ....

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Dec 28, 2014 | 10:51 PM

#24

omni

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can't thank you enough for all your help. and putting up with my dumb questions

Dec 28, 2014 | 10:56 PM

#25

JWC 3

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Can't log on from my home PC ... Sorry .

Dec 28, 2014 | 11:05 PM

#26

JWC 3

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From: Tennessee

Not sure on yours , 1990 colors for front tank , R =power to pump . " O " I guess orange , is ground to pump . Front and rear tank get the ground from same spot . That is for a 90 mdl though ....

Dec 28, 2014 | 11:06 PM

#27

omni

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Thanks for trying. I'll try the ground tomorrow and let you know how it goes. I sure miss my old 77 f150, For a lame back yard mechanic like me,I knew my way around that truck. This 94 is an electrical challenge for me. If I change the pump should I get a complete unit or just replace the module?