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<blockquote data-quote="mirae1" data-source="post: 48556" data-attributes="member: 34314">I have a 1995 GMC Yukon. It has been a good vehicle for the most part. I have 260000 miles on it so it is getting pretty tired but has always run good. The other day I was at a friends house and it wouldn't crank. Tried jumping it and no luck. Friend gave me a ride home and I came back the next day to tow it home. Decided to see if it would crank and it fired right up as if nothing was wrong. (it was about 20 degrees out). Driving it home it suddenly lost power on a slight hill but took off again. Made it almost home and it died. Due to the cold I thought maybe a fuel line freezeup. Towed it on home and put it in the shop and put some Heet in the fuel tank. A couple days later went out and gave it a try and it would crank but would not start. Checking the system I found I was not getting any fuel to the TBI. Fuses and relay were fine. I thought I could hear the fuel pump running (don't hear as well as I use to). Purchased a new fuel pump and just got it put in. Same Issue. Can some one explain the fuel pump circuit. IO know the oil pressure switch is tied to it. Is there a way to &quot;hot wire&quot; the fuel pump to make sure it is working fine? Most of the checks I have require the engine to be running.I have had issues with the ignition module in the steering column in the past and have replaced it. I was wondering if there was something in that that may be preventing power from getting to the fuel pump as it would not crank the night before.</blockquote>

[QUOTE="mirae1, post: 48556, member: 34314"] I have a 1995 GMC Yukon. It has been a good vehicle for the most part. I have 260000 miles on it so it is getting pretty tired but has always run good. The other day I was at a friends house and it wouldn't crank. Tried jumping it and no luck. Friend gave me a ride home and I came back the next day to tow it home. Decided to see if it would crank and it fired right up as if nothing was wrong. (it was about 20 degrees out). Driving it home it suddenly lost power on a slight hill but took off again. Made it almost home and it died. Due to the cold I thought maybe a fuel line freezeup. Towed it on home and put it in the shop and put some Heet in the fuel tank. A couple days later went out and gave it a try and it would crank but would not start. Checking the system I found I was not getting any fuel to the TBI. Fuses and relay were fine. I thought I could hear the fuel pump running (don't hear as well as I use to). Purchased a new fuel pump and just got it put in. Same Issue. Can some one explain the fuel pump circuit. IO know the oil pressure switch is tied to it. Is there a way to "hot wire" the fuel pump to make sure it is working fine? Most of the checks I have require the engine to be running. I have had issues with the ignition module in the steering column in the past and have replaced it. I was wondering if there was something in that that may be preventing power from getting to the fuel pump as it would not crank the night before. [/QUOTE]

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