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Car Forum / Dodge / Dodge Cars / August 2006

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94 caravan about to get the sludge hammer - fuel promblem

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pperry - 15 Aug 2006 10:53 GMT
Question -
i have a 94 caravan 3.3L two wheel drive. im rackin my brain here over
this fuel pump promblem i am haveing. my wife go"s to leave and the van
wont start. i spray it with either and it will start and then dye. so i
narrowed it down to no fuel. i could not hear the pump turn on. so i
pulled the pump and bench tested it and it seem to be workin just fine.
so i went back to van and started to check power going back to the pump.
with the pump out and a test light hooked to the power lead, it seems i
was only getting hit & miss power threw the plug. then i notice the
clicking of the relays. on normal start you should hear 2 clicks from the

relay box{auto trans-fuel pump relay}. when turning the key on and off,
i would only get the 2 clicks and the test light to light up about 5
times out of 20. i tryed changeing relays around, tryed a different relay

from another van and still had the same result. seems the fuel pump
relay does not click half the time when turning the key on. this is with
the tank dropped, pump out, and all pressure released at shrader valve.
i disconected the battery for about 7 min, recontected, then it seemed
like
everything started to work fine, so i plugged the pump in and it all
seemed
good. i put it all back together and the van fired up and i drove it for
a about a week with no prombloms. but now it wont start again with all
the same prombloms. the relay is clicking hit-miss again. at the
begining i thought right away i would just have to do a fuel pump and be
done with it. autozone said you have to buy the whole sending unit and
they want $150. with this electrical promblom i think im haveing, i dont
want to drop $150 in the tank and that not be the promblom. its been 3
days now and it still wont start. the fuel pump wont come on. so i am
going to run direct power and see if it works. .may be im just over
thinkin things here with the price of that pump and all, but something
just
dont feel right. . please help. this is our only car we have to haul
the baby seats in...thanks...perry

heres a follow up on my caravan fuel promblom above. -- i pulled the fuel
pump
relay out and ran a jumper wire to the terminals and the fuel pump came
on.  so i put it all back together, and now the stupid thing is sitting in
the driveway starting and running fine. but i still cant let my wife drive
it because i did not fix a thing. i did all this last week and it ran for
about 4-5 days, then left her stranded.
damnnickname - 15 Aug 2006 11:10 GMT
When you turn the key to the start/run position you only have 3 seconds of
battery voltage at the fuel pump. (designed that way) If you are having a
fuel pump problem and you remove it from the car and bench test it it may
test good at that time.
When a problem like this comes into the shop all we do is smack the bottom
of the tank to get it going again.
When the problem happens again have someone turn the key to the start
postion while you are at the pump and test for battery voltage and a good
ground. If you have those and still no pump replace it!!
Also it is very dangerous to bench test a fuel pump. Not a good habbit to
get into.

Glenn Beasley
Chrysler Tech
 
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