Justin Posted October 28, 2008 Report Share Posted October 28, 2008 Ok I will try to make this short. I just replaced my fuel pump on a 99 s10 blazer with a 4.3 vortec. Because the fuel gauge did not work, but the pump was good all I really needed was a sending unit but I got a deal on the whole thing. Before I replaced it I had no problem with it at all. But after replacing it today I was driving and came to a stop light when I gave it gas to take off it felt like It wasnt getting fuel. And then it finally died so I pulled in a parking lot to figure it out. I tried starting it but it wouldnt start so I let it sit for a few minutes and then tried to start it again which it did and ran fine but then it died after a few minutes. So long story short I have found out that the relay is good and also the pump and ground is good. When I trun the key on the pump only primes some times not all the time like it should like their is a short. I cant figure this at for nothing. Any help would be great! Sorry for the long post. 99 2dr Blazer Kenwood KVT-614 SounDigital SD16k 4 Fi BTL 18s 4 hertz high energy 6.5s comps 4 stock ad244 alts 6 g31s batts 8 runs 0ga Link to comment Share on other sites More sharing options...
00sdime00 Posted October 28, 2008 Report Share Posted October 28, 2008 Check your fuel filter....it may have some crap in it making it seem like its a problem with the pump...it's on the drivers side frame rail about mid cab. also, If there is already enough line pressure, the pump will not need to prime every time you turn the key on. A half-wit gave you a piece of his mind, and you held on to it. My Youtube vids...enjoy anythings possible with the right build =] we accept visa and mastercard =] Link to comment Share on other sites More sharing options...
dadillac27 Posted October 28, 2008 Report Share Posted October 28, 2008 does it still start or does it just crank now?? 1996 Chevy blazer Pioneer deck dehp6800mp clarion eq Hifonics BXI1606d (Subs) 1 18" RE MT Box specs: 6.7cuft @35hz 14.2sqin of port per cuft (Noobtastic design) Crunch GP1400.4 (Mids & Highs) Boston Acoustic mids and highs Stock alt Stinger SP800 Bunch of 0 and 4 gauge wire Link to comment Share on other sites More sharing options...
Justin Posted October 28, 2008 Author Report Share Posted October 28, 2008 I have droped the tank and their is no fuel in the line so it should prime everytime. And no it wont crank. 99 2dr Blazer Kenwood KVT-614 SounDigital SD16k 4 Fi BTL 18s 4 hertz high energy 6.5s comps 4 stock ad244 alts 6 g31s batts 8 runs 0ga Link to comment Share on other sites More sharing options...
badasschevy Posted October 28, 2008 Report Share Posted October 28, 2008 sounds like you have a bad pump. what brand of fuel pump did you buy? bosch pumps are crap for gm vehicles. i would go with a delphi,or the ac delco pumps. center console: lvl 4 12 1.75 cu ft tuned 37htz alpine cda-9886 dc audio 120.4 infinity kappa 6.5" components Link to comment Share on other sites More sharing options...
Justin Posted October 28, 2008 Author Report Share Posted October 28, 2008 The pump is good I have benched tested it and work like new. So its not the pump. I hooked the old one up which worked when benched and when I turn the key on it wont do nothing and the pump sint hooked to the fuel lines so its not primed which means it should come on. So it has to be something else maybe a sensore or something going out is their such a thin? the relay is good so it has to be something else. someone told me a reset switch what is that? Thanks for the replys. 99 2dr Blazer Kenwood KVT-614 SounDigital SD16k 4 Fi BTL 18s 4 hertz high energy 6.5s comps 4 stock ad244 alts 6 g31s batts 8 runs 0ga Link to comment Share on other sites More sharing options...
badasschevy Posted October 28, 2008 Report Share Posted October 28, 2008 have you checked for power back at the connections at the pump?checked the fuse? check the harness for any breaks or corrosion, also might be a good idea to replace it anyway while you have access. heres what the harness looks like. http://www.napaonline.com/MasterPages/NOLM...+Wiring+Harness center console: lvl 4 12 1.75 cu ft tuned 37htz alpine cda-9886 dc audio 120.4 infinity kappa 6.5" components Link to comment Share on other sites More sharing options...
Justin Posted October 30, 2008 Author Report Share Posted October 30, 2008 Mine looks a little different but nothing is wrong with it. I am going to check from the relay back to the harness and also there is alot of corosion on the fuse between the battery and the fuse box under the hood so i will clean that up Also going to check and change the grounds. 99 2dr Blazer Kenwood KVT-614 SounDigital SD16k 4 Fi BTL 18s 4 hertz high energy 6.5s comps 4 stock ad244 alts 6 g31s batts 8 runs 0ga Link to comment Share on other sites More sharing options...
Justin Posted October 30, 2008 Author Report Share Posted October 30, 2008 Ok grounds are clean and ran a extra off the fuel pump harness. Then went the fuse box under the hood and started to mess with it and niticed that when moved the lights cutt on and off what the hell?! So I looked for anything loose but nothing. Any Ideas? 99 2dr Blazer Kenwood KVT-614 SounDigital SD16k 4 Fi BTL 18s 4 hertz high energy 6.5s comps 4 stock ad244 alts 6 g31s batts 8 runs 0ga Link to comment Share on other sites More sharing options...
Justin Posted October 31, 2008 Author Report Share Posted October 31, 2008 Ok it is running again! I got home today and decided to reset the ecu and I fixed the connection on the interior/battery fuse. And I also changed the 5v ground on the fuel pump housing. Then gave it a try and it started and has not died yet so hopefully it is fixed. 99 2dr Blazer Kenwood KVT-614 SounDigital SD16k 4 Fi BTL 18s 4 hertz high energy 6.5s comps 4 stock ad244 alts 6 g31s batts 8 runs 0ga Link to comment Share on other sites More sharing options...
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