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#1 |
Registered User
Join Date: Aug 2010
Location: Ventura
Posts: 151
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1990 Suburban wont start!!
So my 1990 Suburban V2500 4X4 quit running. I had put the truck in reverse and it just shut off. I had to push it into my parking spot. Popped the hood trying to figure out what happen. Only thing I can find is that the fuel pump is not priming or turning on or sending any fuel. ECMB fuse blew the day before, replaced fuse and truck started. Ive changed out relay, and I can feel it click when the key is turned to on, removed fuel filter and turned key to on and no fuel pressure. Cannot figure out why it wont start. been out looking and checking things for 3 hours now. Im at a loss. Any ideas? Also, put a known good fuel pump in and still no start.
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#2 |
Registered User
Join Date: Feb 2007
Location: Sierra Vista, AZ
Posts: 306
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Re: 1990 Suburban wont start!!
It is pretty funny, I am having a similar issue. I would recommend checking the wiring at the fuel pump and the ground there. I am convinced it is an electrical issue but haven't been able to find it either. When I attempt to crank the engine, the lights dim to almost nothing, and the truck struggles to turn over despite a brand new battery. One electrical short off the wrong wire can cripple the truck. I'd chase wires...
I'll keep you posted on my progress, if I make any. Good luck. On a purely cynical note, I think there are guys out there who have had the problem, and fixed the problem, but out of laziness or sense of "did my time, they do theirs" they don't post any replies. Or.... maybe they are just not online. ![]()
__________________
If all men are created Equal* does that mean we are all artifical?
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#3 |
Registered User
Join Date: Aug 2010
Location: Ventura
Posts: 151
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Re: 1990 Suburban wont start!!
I checked all the wires and even replaced the pump with an extra from another truck and still nothing. I put the truck in reverse and it just died and wont start back up. The ecmb fuse blew a few times and got a code 42 but it went away. I cant figure this one out
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#5 |
Registered User
Join Date: Aug 2010
Location: Ventura
Posts: 151
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Re: 1990 Suburban wont start!!
Yes, in tank pump. All wires are good. I put 12v into the pump and it will run but the truck wont make it run. so it has a good ground but when i turn key to on, no prime and no fuel when I try to crank.
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#6 |
I know the pieces fit
Join Date: Nov 2007
Location: MONTGOMERY, AL
Posts: 5,523
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Re: 1990 Suburban wont start!!
There's a fuel pump relay on these isn't there? Maybe not getting hot to it, that could be the short that's popping the fuse.
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#7 |
Registered User
Join Date: Aug 2010
Location: Ventura
Posts: 151
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Re: 1990 Suburban wont start!!
When I turn the key to on all the dash lights come on and I can hear the relay click. Ive also tried another relay and same result. Everything seems normal except the pump wont run. Truck cranks and no fuel. Checked all grounds, wires, relays, fuses. the ecmb fuse doesnt blow anymore. But the pump wont run when you turn key to on.
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#8 |
Registered User
Join Date: May 2012
Location: Colo Springs, CO
Posts: 870
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Re: 1990 Suburban wont start!!
Fuel pump relay ($11.44):
http://www.rockauto.com/catalog/more...027&cc=1061536 Or possibly the oil pressure sender ($29.79): http://www.rockauto.com/catalog/more...762&cc=1061536 I'm going through the same thing but the opposite! My fuel pump won't turn off! I turn the truck off, pull the key out, lock it. Come back an hour later and can still hear my fuel pump running! So, there are two items that could control it. Fuel pump relay on the firewall in the engine compartment and then the Oil pressure sender (to Gauge). Apparently, the oil pressure sender also tells the pump to stay on if the fuel relay fails. I think if it reads over 4 or 6 psi, it kicks the pump on. So, this is what I'm hoping will fix mine. I unplugged my fuel relay but still stayed on so my last resort is the oil pressure. I'll let you know if it works out for me!
__________________
- Jeff 89' K5 Blazer, 2.5" lift, 35" tires ![]() 04' GMC Yukon XL, 3/4 ton, 8.1L |
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#9 |
Registered User
Join Date: Aug 2010
Location: Ventura
Posts: 151
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Re: 1990 Suburban wont start!!
Ive tried new fuel pump relay and nothing. Ive tried unplugging the oil pressure switch and same result. Fuel pump will not prime or run
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#10 |
I know the pieces fit
Join Date: Nov 2007
Location: MONTGOMERY, AL
Posts: 5,523
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Re: 1990 Suburban wont start!!
I'm blue skying here, haven't fixed this type problem before. Next I'd try a jumper wire from the fuel pump relay to the fuel pump. Process of elimination type work.
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#11 |
Registered User
Join Date: May 2011
Location: Texas
Posts: 984
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Re: 1990 Suburban wont start!!
Any updates?
__________________
Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. ©Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010
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#12 |
Registered User
Join Date: May 2011
Location: Texas
Posts: 984
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Just realized how old this is...sorry.
__________________
Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. ©Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010
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#13 |
Automania
![]() Join Date: Jun 2009
Location: Pleasant Grove, in the Mountain West.
Posts: 351
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Re: 1990 Suburban wont start!!
Well,
![]() I now have a similar problem. ![]() |
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#14 |
Just here to tinker
![]() Join Date: Jun 2008
Location: Holland, MI
Posts: 3,692
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Re: 1990 Suburban wont start!!
Just throwing it out there that the oil pressure switch is a normally open switch. So unplugging it does nothing to help your troubleshooting.
__________________
78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725 |
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#15 |
Registered User
Join Date: Aug 2010
Location: Ventura
Posts: 151
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Re: 1990 Suburban wont start!!
Update: Still have the truck. Problem ended up being a wire behind the engine, was rubbed through on the top of the transmission. The fuel pump power wire that runs from relay to the pump. Repaired wire, re-wrapped wiring harness with new loom and its been fine ever since.
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1990 Chevy Suburban v2500 1990 Chevy/Geo Tracker LSi 4x4 2Dr 1996 Chevy/Geo Tracker LSI 4x4 4Dr 2011 Chevy Silverado Crew Cab LT 1991 Nissan 300zx SlickTop |
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ecmb, fuel pump, wont start |
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