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Jeep Wrangler YJ
YJ General Discussion
Fuel Tank and pump
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<blockquote data-quote="machoheadgames" data-source="post: 434849" data-attributes="member: 18789"><p>1990 was not a fuel injected 4.0 year. In 1990 you could only get a carbureted 4.2L or a throttle body injected 2.5L. The tanks of that year would be a metal 14.5 gallon tank with a circular opening, or a 20 gallon plastic tank with a rectangle opening. either engine could have either tank, though the typical was 4.2L 20 gal, 2.5L 14.5 gal.</p><p></p><p>In 1991 they deleted the metal tank, going all plastic, and they started limiting most of them to 15 gallons with a tube inserted into the vent tube that goes back to the filler neck. The tank was still the same size as the 20 gallon before and for the new fuel injected motors for 91, they started using the 87-90 sending unit with a fuel pump inserted into it. Somewhere in there, probably between 91 and 92, they changed the fuel sender ohm readings. the fuel gauges changed from 91 to 92, so that's why I imagine the ohms changed then.</p><p></p><p>So either that Jeep is not a 1990, or the owner doesn't know what engine it actually had.</p><p></p><p>If you are replacing with a plastic tank, I would just get a 91-95 fuel pump and sending unit combo, install it into the new plastic tank, and delete the external pump they added. The stock in tank pump is already high pressure and supports about 100 PSI. It would be pretty tough to out-engine the stock pump.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 434849, member: 18789"] 1990 was not a fuel injected 4.0 year. In 1990 you could only get a carbureted 4.2L or a throttle body injected 2.5L. The tanks of that year would be a metal 14.5 gallon tank with a circular opening, or a 20 gallon plastic tank with a rectangle opening. either engine could have either tank, though the typical was 4.2L 20 gal, 2.5L 14.5 gal. In 1991 they deleted the metal tank, going all plastic, and they started limiting most of them to 15 gallons with a tube inserted into the vent tube that goes back to the filler neck. The tank was still the same size as the 20 gallon before and for the new fuel injected motors for 91, they started using the 87-90 sending unit with a fuel pump inserted into it. Somewhere in there, probably between 91 and 92, they changed the fuel sender ohm readings. the fuel gauges changed from 91 to 92, so that's why I imagine the ohms changed then. So either that Jeep is not a 1990, or the owner doesn't know what engine it actually had. If you are replacing with a plastic tank, I would just get a 91-95 fuel pump and sending unit combo, install it into the new plastic tank, and delete the external pump they added. The stock in tank pump is already high pressure and supports about 100 PSI. It would be pretty tough to out-engine the stock pump. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Fuel Tank and pump
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