99 L31 Burb won't start

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

HotWheelsBurban

Gotta have 4 doors..... Rawhide, TOTY 2023!
Joined
Sep 18, 2019
Messages
9,850
Reaction score
18,024
Location
Houston, Texas
'99 C1500 Burb,L31 5.7, was running okay when parked the other day. Will crank but not fire and run. I checked the Schrader valve on the fuel rail and no fuel spurts out. I can't hear the pump when I put the key in On either. Fuel pump relay is only a few years old and looks brand new, no corrosion. Starter and battery are good as well, only a couple months old. I also swapped out the Crank fuse cause it was a little corroded. I bought a new module and coil but haven't installed them; no point if it's not getting fuel?
Anyone got any ideas? I really need to get this one running since my crew cab dumped me and a new transmission for it, isn't in the budget soon. Thanks in advance!
 

PlayingWithTBI

2022 Truck of the Year
Supporting Member
Joined
Jan 3, 2019
Messages
9,696
Reaction score
15,077
Location
Tonopah, AZ
I can't hear the pump when I put the key in On either.
IDK about your newer trucks but, on my old one there's a fuse feeding the fuel pump relay. As mentioned above try jumping the relay after you verify you have 12volts there.

Which pins? There are 5
Sorry, I can't help you there, do you have an FSM for it?
 

stutaeng

I'm Awesome
Joined
Aug 7, 2019
Messages
3,410
Reaction score
4,351
Location
Dallas, TX
There's also a wire just hanging there near the fuse block that's supposed to be for energizing the fuel pump. But I'll be honest, I've (edit: never had to) jump it myself.
 
Last edited:

HotWheelsBurban

Gotta have 4 doors..... Rawhide, TOTY 2023!
Joined
Sep 18, 2019
Messages
9,850
Reaction score
18,024
Location
Houston, Texas
No fuse for fuel pump, only the relay. I checked both boxes. I don't have a jumper wire for these tiny terminals.
 
Top