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post #1 of 12 Old 08-21-2014, 09:17 AM Thread Starter
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injection pump? wth is going on

Driving home lastnight fuel pressure dropped to around 1000 psi came back to normal then did it again. So i started pulling over stopped put it in park everything was back to normal between 5700 and 5800 psi. Crawled under the truck to see if the lift pump may have been cutting out. It was running. Got back in pushed the brake to put it in drive. Died cycled the key a few time started ran for about 20 seconds died again. Pulled the top filter cap it was full of fuel the lift pump pumps fuel. When it starts it revs up like its frp will get to 15000-20000 and then dies again... filters have less than 50 miles on them any input is much appriciated.
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post #2 of 12 Old 08-22-2014, 01:43 PM Thread Starter
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Well according to the ford house it is a high pressure fuel pump. Right around 3500 parts and labor.. hope they are correct.. its just odd to me that the pump could hit 24000 psi rail pressure. Idk to much about these pumps but i do know that the 6.9/ 7.3 idi injectoin pumps and the cummins pumps dont half way go out and just work when the want they just continue to get week. What makes the 6.4 hpfp work then not work?
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post #3 of 12 Old 08-22-2014, 02:34 PM
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There is a regulator inside the pump that can't be replaced without replacing the pump... It's that critter that causes likely 70% the grief hpfp's encounter.. Sucks, man... Sorry to hear of your trouble.
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post #4 of 12 Old 08-23-2014, 07:27 AM Thread Starter
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Thats what i was thinking could have been the only possible problem.. i was hoping to get to put an industrial injection pump if i ever had to upgrade but im 1500 miles from home and need it. I guess necessity always out ways want. Thanks for the input
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post #5 of 12 Old 08-23-2014, 03:50 PM
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had the same exact problem on mine.. its been in the shop for a month now waiting on the green light between insurance/warranty company.. my bill was 8300 though since it took out low pressure pump, high pump and injectors... i feel your pain


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post #6 of 12 Old 08-23-2014, 05:01 PM Thread Starter
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They told me everything else was ok no metal shavings. But i had an extended warranty that expired 6 days before this happened.. talk about bad timing
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post #7 of 12 Old 08-23-2014, 05:31 PM
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Sorry about your luck. 3500 seems to be the number most dealers and shops are at. Last one I did was 1100 wholesale ford cost for a pump and 2 lines. About 10 hours of labor. The price you pay for advanced technology trucks. Lol

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post #8 of 12 Old 08-23-2014, 06:54 PM Thread Starter
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Yea they said it was 1668 for all the parts and 18.4 hours of labor. Makes me miss my 2001 7.3 a little bit lol. But it only had about half the hp
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post #9 of 12 Old 08-23-2014, 06:56 PM Thread Starter
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And i have to eat the cost of labor because im not about to attempt to change the hpfp in a camp ground
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post #10 of 12 Old 08-23-2014, 07:32 PM
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In my experience it's much easier to change with the cab off of the truck. A lot of guys like to take the front couple cab bolts out and slightly lift the cab to do the job. They separate the turbos (ford specifically says not to) and other things to get the job done.

It's all around easier to pull the cab. Use a turbo bracket and hoist and leave the turbos connected. Obviously you don't have the option in your situation but trying to do it at a campground wouldn't work very well at all IMO

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