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In tank electrical connections

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centexk5

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Need to tie in my fuel pump into the harness that goes into the sending unit. How do y’all do that for in tank and protect the connections? Fuel resistant heat shrink? I’m thinking of trying to unpin the wires in the gray connector on top and connecting the fuel pump that way. D4ECB0D1-53D8-4B8F-89AF-196F25D5E711.jpeg
 
I used Grote heat shrink when I did mine. 3-4 years back. Tested it unscientifically by l dunking in jar of gas for week. Found no noticeable change. Haven’t pulled my fuel pump out since I did it. But so far no issues.
 
Gas is non-conductive if that’s what you’re worried about. It also has such a low surface tension that I’m sure it gets inside any intank motor you put in there, which is why it’s a good idea not to run them low on fuel since the gas helps keep it cool. Also, I highly doubt that the fuel to air ratio inside the tank is conducive to combustion from any shorts. So if you stager the connections you should be fine.
 
Worried about a spark making a big boom. Seems everything I’ve read says to just stagger the connections and be done with it. No worry about a bare solder connection or nothing.
 
centexk5 said:
Worried about a spark making a big boom. Seems everything I’ve read says to just stagger the connections and be done with it. No worry about a bare solder connection or nothing.
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Remember, 14.7:1 for engine combustion. I find it hard to believe there’s ever that much air in a tank.
 
I have done a ton of in tank electric pumps. All factory stuff.
The factory was never concerned with keeping gas away from electricity. Only keeping connection from shorting.
 
centexk5 said:
Need to tie in my fuel pump into the harness that goes into the sending unit. How do y’all do that for in tank and protect the connections? Fuel resistant heat shrink? I’m thinking of trying to unpin the wires in the gray connector on top and connecting the fuel pump that way.
Click to expand...
You are exactly on track.

If the wires are long enough, see if you can recrimp and repin the connector.

If that doesn't work, chemical resistant heat shrink is in order.

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Yes, theoretically it won't explode if its too much gas in it, don't take that chance, just prevent the arcing.
 
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I left mine stock and haven't had any issues. I used a spectra pick up and a AEM fuel pump
 
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He has an aftermarket high pressure fuel pump for MPFI, he can't leave the stock TBI pump in there.

I think I would try to unpin the bottom connector, may be easier to correct if it get messed up.

Also, I see a setback from that internal Holley pump, a genuine Walbro sometimes comes with the connector to adaptor it without re-pinning or soldering.
 
The wires on the Holley pump connector are molded into the connector. No way to unpin those. I got one of the pins out of the gray connector on top but I can’t get the crimp undone without destroying the pin. Put it back together and ordered that McMaster heat shrink.
 
I remember doing that to my truck almost 13 years ago. I soldered and heat shrinked just because I didn't want the extra connector to fail.
 
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