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Unread 07-15-2014, 08:23 AM   #1
94cherry
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Fuel pump swap question.

I put a cheaper fuel pump in my 94 5.2 about 4 months ago and now the fuel gauge is doing the floaty thing. I plan on putting a bosch pump in when I get the bucks. My 95 4.0 has a good pump and the gauge works fine. Can I swap pumps until I get the bosch for the 5.2?

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Unread 07-15-2014, 09:35 AM   #2
Uniblurb
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Believe maybe you've seen me post this link around 94cherry to a brand new Bosch 67617 fuel pump module for a 93-94 4.0 or 5.2 which is an outstanding price at $120! Free shipping, comes with a tank seal, runs cool/quiet, and Bosch is OE.

http://www.ebay.com/itm/NEW-BOSCH-67...253643&vxp=mtr

As far as temporarily installing your used pump/module from your 95 4.0 into your 94 4.0 it most likely wouldn't work correctly. I stuck it in the above link compatibility chart and it shows it's incompatible.

And in looking up fuel pump modules in the 94-96 parts list it shows the 94 OE as 52005099, which the above Bosch 67617 replaces, while the 95 takes an OE 52018796 which is different. May be like my 96 4.0 where only that year is specific to a certain pump module.
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Unread 07-15-2014, 10:49 AM   #3
94cherry
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Thanks Unlblurb. Guess I will just put up with the gauge until I can save the $120 for the bosch.
At least the gas light comes on when im down to about 5 gallons.
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Unread 07-15-2014, 11:20 AM   #4
HighLonesome
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Quote:
Originally Posted by 94cherry View Post
Thanks Unlblurb. Guess I will just put up with the gauge until I can save the $120 for the bosch.
At least the gas light comes on when im down to about 5 gallons.
Interesting. I thought the idiot light was tripped by the sender, which you are assuming is bad.
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Unread 07-15-2014, 02:20 PM   #5
94cherry
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Quote:
Originally Posted by HighLonesome View Post
Interesting. I thought the idiot light was tripped by the sender, which you are assuming is bad.
Gauge works fine when full but when it gets down to 1/2 a tank (noted by miles on odometer, Right now needing a tune up I get about 150 miles per half tank.) Then the gauge goes nuts going from half to empty plus sitting there pulsating like a heart beat. The light came on at about 300 miles so I stuck a hose in the vent tube then drained the tank as far as i could. Put 5 gallons in, the light was on but the gauge was on empty. Before this problem started the light would come on when the gauge read between 1/8 and empty.
Wires are tight on outside of tank and at connector ( also cleaned and put electrical grease on connector) So my best guess is that because I bought a cheap Ebay pump the sending unit is whacked.
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Unread 07-15-2014, 09:42 PM   #6
Uniblurb
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Quote:
Originally Posted by 94cherry View Post
Thanks Unlblurb. Guess I will just put up with the gauge until I can save the $120 for the bosch.
At least the gas light comes on when im down to about 5 gallons.
No problem and it's worth it! Actually you're only about a gal off since the low fuel indicator light is supposed to come on a 4 gals. Lol.


Quote:
Originally Posted by 94cherry View Post
Gauge works fine when full but when it gets down to 1/2 a tank (noted by miles on odometer, Right now needing a tune up I get about 150 miles per half tank.) Then the gauge goes nuts going from half to empty plus sitting there pulsating like a heart beat. The light came on at about 300 miles so I stuck a hose in the vent tube then drained the tank as far as i could. Put 5 gallons in, the light was on but the gauge was on empty. Before this problem started the light would come on when the gauge read between 1/8 and empty.
Wires are tight on outside of tank and at connector ( also cleaned and put electrical grease on connector) So my best guess is that because I bought a cheap Ebay pump the sending unit is whacked.
The below info is from the 95 XJ-YJ FSM since I don't have the ZJ one for 95 but the principal should be the same. The electric contact on the swing arm rides against the resistor coil. The higher the resistance the lower the fuel level. Since your gauge goes wonky at half a tank they must have had a monkey wind the resistor coil!

Here's the way the low fuel level warning lamp works.
zj-low-fuel-warning-light-95-xj-yj-fsm.jpg

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96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 93 4.0 XJ (spare), 96 4.0 XJ (son's)

-Stalling ZJ? 12 things to check before replacing a sensor; the Dirty Dozen
-Crankshaft position sensor multimeter test. & video of testing.
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