only starts when plugged in, not overnight

[jamesh23]

I have 95 f250 extended cab powerstroke, ok, Im thinking glow plugs and glow plug relay, ill prolly just replace both if you guys agree with me, I found a kit for $110. But if I leave my truck overnight, it will not start just crank and crank and crank but never start, unless it gets shot with starting fluid, I have only done it twice cuz I didnt know itwas bad and the other time was an urgent matter. Now if I plug it in overnight or for 2 or 3 hours, it starts right up fine, and once its started for the first time in the day it will start right up all day long.

what do you guys think? thanks

[CHUCK]

i'd check voltage across the GP relay and ohm the glow plugs b4 I'd start replacing parts. On the other hand, at the least, you know she has a new GP relay and GPs

[Nashotah7]

Put my money on the glow plug relay.

[jamesh23]

just put in a new fuel filter today, I plugged it in overnight last night and it still didnt start this morning, just cranked and cranked and cranked and the fuel filter light came on, So I changed it out, im sure it will help anyway it wasnt very expensive and the old one was dirty, ill be ordering the GPR tonight and changin the oil in the morning.