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Ask Tims Auto Repair Your Own Question
Tims Auto Repair
Tims Auto Repair, GMC Mechanic
Category: GMC
Satisfied Customers: 15699
Experience:  have owned a repair shop for 25 years
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Van ran fine then changed battery now fuel pump don't kick

Customer Question

Van ran fine then changed battery now fuel pump don't kick on
Submitted: 10 months ago.
Category: GMC
Customer: replied 10 months ago.
It's a 93 gmc vandura 2500.. I have changed fuel pump, relay, fuse under driver seat marked fuel pump and oil pressure switch and nothing other then when I did change oil pump SW it kicked on for about 10 sec then died and would not start back up
Expert:  Tims Auto Repair replied 10 months ago.
Hi, My name is ***** ***** for the delay.I will do my best to assist you.what engine do you have?
Expert:  Tims Auto Repair replied 10 months ago.
when you first turn on the key,do you hear the fuel pump come on for 2 seconds?
Customer: replied 10 months ago.
5.7 l v8
Customer: replied 10 months ago.
I don't hear fuel pump kick on at all
Customer: replied 10 months ago.
It ran fine before I changed the battery then right after I changed the battery and tried to start it nothing, it cranks fine just won't turn over.. So I think it's not getting fuel cuz I don't hear pump kick on.
Expert:  Tims Auto Repair replied 10 months ago.
okdoes the fuel pump relay click on for two seconds when you first turn the key on?
Customer: replied 10 months ago.
Did not check that but it's a new relay I just put on
Expert:  Tims Auto Repair replied 10 months ago.
i understand its new,,we just need to know if it is coming on..it should have a faint click for 2 seconds when you first turn the key on
Customer: replied 10 months ago.
Got ya.. I have not checked that but I will check it after work.. I don't think it is clicking because I was in hood when I had someone try it and don't remember hearing anything
Expert:  Tims Auto Repair replied 10 months ago.
if the relay isnt clicking on,,you need to first check the ecm fuse
Expert:  Tims Auto Repair replied 10 months ago.
if the fuse is good,i would think the problem would be the ecm[computer] itself
Expert:  Tims Auto Repair replied 10 months ago.
the good thing is,these older ecm[computers] cost less than $100+/- now
Customer: replied 10 months ago.
Ok well I changed/checked all the fuses and they were ok other then a couple for lights I changed out
Expert:  Tims Auto Repair replied 10 months ago.
ok,we need to know if that relay clicks on
Customer: replied 10 months ago.
I'll I'll have to check it.. So if it does click it may be ecm but if no click and fuse is good then what?
Customer: replied 10 months ago.
Also where is the ecm located
Expert:  Tims Auto Repair replied 10 months ago.
no,,if it does click,i would think the ecm is good,if it doesnt then the ecm may be bad
Customer: replied 10 months ago.
Ok got you so if it does click then what's next step?
Expert:  Tims Auto Repair replied 10 months ago.
Location Inside passenger compartment under driver's seat.
Customer: replied 10 months ago.
Got ya.. So when I changed battery could I have caused a spark causing it to blow the ecm or why did this happen after battery change do you think
Expert:  Tims Auto Repair replied 10 months ago.
yes,that is a possibility
Expert:  Tims Auto Repair replied 10 months ago.
thats what we need to find out
Customer: replied 10 months ago.
I see.. So if no click from fuel relay then best bet is its the ecm and that would make since that changing batter caused this you say...
Customer: replied 10 months ago.
I'm pretty sure it don't click and the fuel pump as well does not come on.. So ecm change out and go from there?? They are $104 at autozone so not bad
Customer: replied 10 months ago.
I leave work in 20 mins and autozone is 5 mins away so going to get ecm and try that.. When I install it do I just unplug and plug new one in or
Expert:  Tims Auto Repair replied 10 months ago.
no,,dont just replace the ecm without some tests
Expert:  Tims Auto Repair replied 10 months ago.
you got to take the prom chip out of your old ecm and put it in the new one..you must have your old one to trade in.
Customer: replied 10 months ago.
Well my wife and son tried it and said they don't hear a click at relay so??
Customer: replied 10 months ago.
Ahh ok so will they do that for me at autozone and then I bring it home and just hook it up after chip is switched
Expert:  Tims Auto Repair replied 10 months ago.
yes
Customer: replied 10 months ago.
Ok so if it's not clicking at relay then you think ecm right and all I do is bring them old one and they change chip and I plug in new one and can try and start it up right after?? No teaching anything like that
Expert:  Tims Auto Repair replied 10 months ago.
can you accept the phone call option,i would like to talk to you before you waste money.
Customer: replied 10 months ago.
Thanks but no thanks I need the rest on my card for car repair sorry if I could I would
Expert:  Tims Auto Repair replied 10 months ago.
the new ecm will be plug and play after the prom is installed,no relearning
Customer: replied 10 months ago.
Ok great and and autozone will know what to take out and put in the new one right
Customer: replied 10 months ago.
The ecm is not under seat where could it be inside dash??
Expert:  Tims Auto Repair replied 10 months ago.
what is the size of your van?
Expert:  Tims Auto Repair replied 10 months ago.
is it a 1500 or a 2500?
Customer: replied 10 months ago.
g2500 3/4 ton. Autozone says they will need old one and they send it in but she said on some cars they have stock of rebuilt ones but they computer was down so she could not look it up but I'm pretty sure there web site had already rebuilt ones for 104 bucks
Expert:  Tims Auto Repair replied 10 months ago.
it should be undr the seat..stand by
Expert:  Tims Auto Repair replied 10 months ago.
are you sure it is a 93 model?
Customer: replied 10 months ago.
Yeah it's a 93 vandura 2500 explorer edition with a high top
Expert:  Tims Auto Repair replied 10 months ago.
it should be under the passenger front seat
Customer: replied 10 months ago.
It's for sure not under seats and I looked online and it says under driver seat but one guy said they installed his behind the dash on passenger side and he had to take dash off
Expert:  Tims Auto Repair replied 10 months ago.
it may have been moved by the conversion company
Customer: replied 10 months ago.
I checked all seats and the bench/bed seat and nothing.. The driver seat has some wires but they all go to power seat
Customer: replied 10 months ago.
So gmc makes the van and the explorer edition is done somewhere else I assume
Expert:  Tims Auto Repair replied 10 months ago.
that is correct,the conversion is done by a different company.explorer in your case.
Expert:  Tims Auto Repair replied 10 months ago.
it may be behind the dash or maybe even under the hood,,but it is originally under the seat
Expert:  Tims Auto Repair replied 10 months ago.
if you are at the van,tell me if the fuel pump relay clicks one click when you first turn the key on?
Customer: replied 10 months ago.
No clicks at all that I can hear
Expert:  Tims Auto Repair replied 10 months ago.
ok..if you are sure that it doesnt click,then it is likeley the ecm..though,i have no idea were this conversion company has moved it to

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