Fuel pump wiring issues?

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Fuel pump wiring issues?

Postby 80chevmonzacoupe » Tue Nov 09, 2010 9:02 pm

Hey guys
I was driving my 80 monza coupe and it just died. I had no fuel what so ever so I got a new fuel pump and slapped it all together, turned the key over still nothing there is a light on in the dash board when the key is turned over. Iv tried 3 other fuel pumps and even my 1979 monza spyder gas tank still nothing. Any clues haha it stumped me.
1980 Chevrolet monza coupe.
Start of my monza project.

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Re: Fuel pump wiring issues?

Postby spencerforhire » Tue Nov 09, 2010 9:20 pm

First place to look is the oil pressure switch; it connects the pump power(blue) to ignition(pink) only when there's oil pressure. At rest, the blue is connected to the violet(start) wire.
The "fleet"-
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
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01 Saturn SC2- younger son's project
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and 3 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

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Re: Fuel pump wiring issues?

Postby cjbiagi » Tue Nov 09, 2010 9:40 pm

Have you checked the fuse? If it's ok you need to take some voltage measurements to see if you have power and a good ground to the pump.
Clyde.........75 Monza 2+2
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Re: Fuel pump wiring issues?

Postby stage169 » Tue Nov 09, 2010 10:29 pm

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Re: Fuel pump wiring issues?

Postby 80chevmonzacoupe » Wed Nov 10, 2010 3:45 pm

Lol I don't have the wire that goes to the pressure switch. But the rest is all wired the same. So could it be because I don't have that plugged in there's no power going to it? I have checked the fuses there fine too.
1980 Chevrolet monza coupe.
Start of my monza project.

http://i1202.photobucket.com/albums/bb3 ... 04baee.jpg
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Re: Fuel pump wiring issues?

Postby 80chevmonzacoupe » Wed Nov 10, 2010 3:48 pm

Lol I don't have the wire that goes to the pressure switch. But the rest is all wired the same. So could it be because I don't have that plugged in there's no power going to it? I have checked the fuses there fine too. When I got the car some of the wire harness was all chopped up, so I did what i could. Everything good but the pump lol. Is there a 350 mechanical fuel pump that fits passed the v8 motor mount?
1980 Chevrolet monza coupe.
Start of my monza project.

http://i1202.photobucket.com/albums/bb3 ... 04baee.jpg
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Re: Fuel pump wiring issues?

Postby my79monza » Wed Nov 17, 2010 3:47 pm

Check out V/8Monza.com it shows the modification to the motor mount bracket in order to use a mechanical fuel pump.
You can add the pressure switch in order to power the electric pump, just a little wire splicing and since you mentioned that the harness was botched up it shouldn't be dificult to do.
I am using a Carter after market pump located in front of the tank and using the factory wiring.
I have a 80 monza wiring diagram book and can find the colors and location to splice to if you desire to go that way.
Merle
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Re: Fuel pump wiring issues?

Postby monzajer » Wed Nov 17, 2010 4:02 pm

Here is another link:

viewtopic.php?f=14&t=31523&start=0

and another:

viewtopic.php?f=14&t=30942#p169985

click on the V8monza.com link, scroll down a little and that will show you the cut-out Merle is referring to.

Good luck and have fun!

cheers jer :mrgreen:
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1977 Chevrolet Monza Sport Hatchback


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