99 yukon cranks but no start?? 5.7

ezbtr

ezbtr

Commander
Joined
May 1, 2002
Messages
2,965
Arghhhh now at 93K cranks but won't start - dont hear fuel pump charging like I always do, pulled ignition relay and AM getting juice across relay terminals, bad relay? New cap, rotor, plugs 2 mos. ago and was running perfect til I parked it at home last night. I'm not thinking fuel pump as I don't hear it charging.

Update: I swapped relays no change, and I AM getting spark to the plugs.

Thanks!
 
Dunaruna

Dunaruna

Admiral
Joined
May 2, 2003
Messages
6,027
Re: 99 yukon cranks but no start?? 5.7

You need to find the fuel pump relay, not ignition relay.

It's a faulty relay or pump.
 
Bob_VT

Bob_VT

Moderator & Unofficial iBoats Historian
Staff member
Joined
May 19, 2001
Messages
26,022
Re: 99 yukon cranks but no start?? 5.7

Fuel pump in the tank is a common failure. I have seen mechanics hit the tank HARD with a rubber mallet while it is being cranked and sometimes it it restarts the fuel pump..... but not at all a permanent fix. My WAG (Wild A55 Guess) is the fuel pump.
 
jimr

jimr

Senior Chief Petty Officer
Joined
Mar 21, 2004
Messages
723
Re: 99 yukon cranks but no start?? 5.7

I agree with Bob have someone crank it over and give it a wack with a hammer. it may or may not work.
 
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