Question about 1990 Ford F150

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Cold starting problems in the morning. Fuel

Cold starting problems in the morning. Fuel injected, where should I start. Good cranking just no start,,,then after five minutes of cranking, it starts.

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  • jghbornbad Nov 16, 2009

    hey i know it should have two pumps. however, i have checked and it only has an intank pump. It is a 4.9 L, 4X4 f150, 1990. is that correct. No block mechinal pump. and no duel pump either..what u think

  • jghbornbad Nov 16, 2009

    i have more questions, sounds right however there was only an intank fuel pump. no mechanical pump stll have problem

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Hello.
First place I would look in this case is fuel pressure. These trucks use 2 fuel pumps, 3 if it has dual fuel tanks.One low pressure supply pump in each tank (2 tank system) and one high pressure pump on the frame rail.
I suspect from the symptoms you are describing that the low pressure feed pump may be your issue here. The reason being is the high pressure fuel pump isn't great at pulling fuel, only pushing it.
So therefore the supply pump may be weak and slow to help out causing your slow starting.
when checking this setup you may read good pressure because the secondary pump will put it there but it may be mostly air because it is cavitating, There is a schrader valve on the fuel injector frame rail that is your fuel pressure test port. Cycle the key and depress the valve core. It should be fuel only-not air. Careful here, it should be around 45 PSI pressure and I don't want you getting sprayed with fuel. Also don't try this with a hot engine. Have a rag handy to wipe up any excess fuel spillage.
I have seen this happen many times in my years as a Ford tech.
I doubt your problem is ignition related.

Posted on Nov 16, 2009

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