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Here's my understanding after owning two of these. The 4.3 "W" CPI will not start with anything less that 54psi. Check your fuel line for leaks, thus low pressure. If no leaks and you have the new filter placed in with the flow going the correct way then it may be your pump. I dout it would be you CPI unit primarily because your not developing fuel pressure. I have had a new CPI go in just 4 months after having one replace. Luckily the manufacturer stood behind thier product and replaced the unit free of charge. Hope this helps!!
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