my old flatbed takes a long time to crank, i bleed a little air out of the water seperator/ fuel filter then it runs good. leave it sit for a while and same thing. where should i start looking?truck is a 91 f 350 x-uhaul
Experienced Scrapper
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my old flatbed takes a long time to crank, i bleed a little air out of the water seperator/ fuel filter then it runs good. leave it sit for a while and same thing. where should i start looking?truck is a 91 f 350 x-uhaul
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I had a Chevy diesel that started doing that and as I checked under the hood I noticed that diesel was seeping out around a bushing for the throttle feed on the injector pump. Diesel would leak out and let air in. I would have to crack open an injector line at the motor to let the air bleed out. I just had a diesel shop rebuild it and they turned the pressure up 10%. They used an improved type of bushing so it wouldn't happen again.
You could also have a line cracked or loosening up.
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Experienced Scrapper
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thanks, hopefully it is not an ip problem.
been thinking about getting it turned up but then i think about the fuel i will use. it is a dawg though, i was pulling a 30' boat the other day and it slowed down to 30 going over a high rise bridge black smoking and working hard. the boat is pretty heavy.
Last edited by danielms; 03-26-2012 at 11:47 PM.
Metal Recycling Entrepreneur
maybe your fuel supply pump isn't strong enough to push it on through at low rpm
Last edited by Bear; 03-27-2012 at 12:33 AM.
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After they turned mine up it was like a whole new motor, they did not turn up the fuel, they turned up the pressure to the injectors so the fuel would hit the injector harder and create a better spray pattern for a better burn.Originally Posted by danielms
My power went way up and the fuel mileage went up by 2. I could take a 35 foot travel trailer up Snowshoe mountain in Pa. and the truck would not drop below 45 climbing that mountain.
Experienced Scrapper
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sweet may see if they can do that on mine.
Metal Recycling Entrepreneur
Dano...
On the IDI fords the common causes of what you describe are 1. the lift pump this is a mechanical fuel pump that primes the injector pump. If it sits for a a while the has to crank and crank before even smoking to start then this is a good place to check. The other is the return feed lines. or the little black lines that run between the injectors. They get cracked and air leaks in them and causes air locks in the system as a whole. These are the two most common and least expensive fixes. But they do fit you description. I run several of these IDI fords in both the 6.9 and 7.3 like you have they are good long life engines and usually the cheap easy to fix things get overlooked.
KrazyJ
Experienced Scrapper
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will check the lift pump, the return lines look new but if the pump does not fix it i will try that before more expensive things.
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