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Old 06-07-2011, 04:43 PM   #1
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1990 Jeep Wrangle Fuel Pump Help

I brought my Jeep to the garage because the fuel pump wasn’t turning on. Well, actually no, I brought it there because the guy who I bought it from put in an aftermarket alarm system and I took the key out of it and then the power never went back on.

But before that, it would take about 20 tries of me turning the key in and out for the fuel pump to turn on (often having my brother kick the back of the car to help it, although I don’t know if that actually helped)

Anyway, the garage owner called me today and was like we fixed the wiring but you need a new fuel pump. And he said that the car is so old and rotted that if he changed it out I need a new gas tank and, to top it off, he said that they don’t make the sender unit of this car anymore. So I went to this website, did some research and all I could find was one person with the same problem (with many confirming that they don’t make the sending unit anymore) and he found the pump and sending unit at a junk yard.

What should I do? The mechanic said that it is not worth the money because the engine has 180k on it and if he fixes the pump it all needs to be replaced because it is so rusty.

But because the fuel pump was “sometimes” working isn’t there a chance it might be the wiring? How could someone check that? Would they need to take it all apart?

Can I hook up a cheep fuel cell or something or is that a stupid question?

Please note that the car is not insured or registered I only use it for offroading on my own land so ANY advice is wanted.

Thanks,

JP

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Old 06-07-2011, 05:59 PM   #2
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ebay buddy. I have a 93 and replaced the entire sending unit for $150. got it off ebay and my gas tank is plastic, is yours?

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Old 06-07-2011, 07:02 PM   #3
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Quote:
Originally Posted by jtomasi
I brought my Jeep to the garage because the fuel pump wasn’t turning on. Well, actually no, I brought it there because the guy who I bought it from put in an aftermarket alarm system and I took the key out of it and then the power never went back on.

But before that, it would take about 20 tries of me turning the key in and out for the fuel pump to turn on (often having my brother kick the back of the car to help it, although I don’t know if that actually helped)

Anyway, the garage owner called me today and was like we fixed the wiring but you need a new fuel pump. And he said that the car is so old and rotted that if he changed it out I need a new gas tank and, to top it off, he said that they don’t make the sender unit of this car anymore. So I went to this website, did some research and all I could find was one person with the same problem (with many confirming that they don’t make the sending unit anymore) and he found the pump and sending unit at a junk yard.

What should I do? The mechanic said that it is not worth the money because the engine has 180k on it and if he fixes the pump it all needs to be replaced because it is so rusty.

But because the fuel pump was “sometimes” working isn’t there a chance it might be the wiring? How could someone check that? Would they need to take it all apart?

Can I hook up a cheep fuel cell or something or is that a stupid question?

Please note that the car is not insured or registered I only use it for offroading on my own land so ANY advice is wanted.

Thanks,

JP


What engine do you have? I call BS on the mechanic... If you care to become mechanically inclined at all, I am sure you could do the work yourself and find it not to be so involved. You mention it is a full time off road vehicle.... Gut the rear, drop in a fuel cell with new sender and drive it 'til it falls apart.
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Old 06-08-2011, 08:09 AM   #4
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The tanks is metal, which is why i think he said i would need a new one if he took it off. Yea, I was thinking a fuel cell - does anyone know where I could get one for cheap? Does it matter what sending unit i get with the fuel cell?

Thanks,

JP
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Old 06-15-2011, 06:22 PM   #5
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HOLD UP! Doesn't the 1990 4.2 have a mechanical fuel pump the the r/h side of the engine?
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Old 06-15-2011, 06:33 PM   #6
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Yep!! Sure does. I was wondering when somebody was gonna get to that. 25 bucks at OReilys.
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Old 06-28-2011, 02:30 PM   #7
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Similar Issue...

I was wondering which kind of fuel pump I had on my 1990 Wrangler. I was told I needed a new fuel pump as well. Whenever I would look one up, it displayed 3 option. Two mechanical (fwd facing and rear facing) and one electric. I am new to Jeep'n and would love to learn something new. Regardless of fwd or rear facing, is the fuel pump I'm going to need on my Wrangler with the 4.2L in line 6 engine in fact a mechanical fuel pump? Thanks in adavnce for your help and this site is awesome!
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Old 06-28-2011, 07:51 PM   #8
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Not entirely sure about the 6 but my 90 2.5 is electric. In the tank and one piece with the sending unit.
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Old 06-28-2011, 08:55 PM   #9
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I have a 1988 with the 4.2 and it is mechanical on the block. 5 mins to change. It is carborated though. Is the a 4.2tbi?
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Old 06-28-2011, 09:07 PM   #10
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The 90 4.2 in mechanical fuel pump and carburated. The fuel injection came out in 91.
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Old 06-29-2011, 11:55 AM   #11
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Thank you all for your help. Took all of your info and also invested in a Hayne's manual. I do in fact have a 4.2L in line 6 with a carb. The fuel pump is mechanical on the RH side of the engine block and O'reilly's has is for 21 bucks! Thank you ALL very much for your help. New to being a Jeep owner,but this site and your help makes the hiccups I'll face with a '90 less discouraging. Take care!
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Old 06-29-2011, 12:30 PM   #12
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yeah so deffinitly a BS shop
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Old 08-11-2011, 01:26 AM   #13
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Quote:
Originally Posted by MellowYellow89YJ View Post
What engine do you have? I call BS on the mechanic... If you care to become mechanically inclined at all, I am sure you could do the work yourself and find it not to be so involved. You mention it is a full time off road vehicle.... Gut the rear, drop in a fuel cell with new sender and drive it 'til it falls apart.
If you need parts for your jeep like me with a 1990 wrangler automatic with a 4.2L you will find most of your parts at Napa Auto Parts/Riebes/Kragen/O'Reily are your places to go. Pepboys and Auto Zone carry very few parts for the older jeeps

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