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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23001
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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I have a 2008 ford F 150 running lean. First we checked fuel

Customer Question

I have a 2008 ford F 150 running lean. First we checked fuel pressure was about 35 while running. Installed filter and fuel pump now high fuel pressure over 130 we also changed spark plugs and coil packs. It started out with no power on top end would not run at highway speeds. Now it is running very lean burning eyes and hardly running. Fuel driver looks good bowed all lines out do you have and suggestions ? Please
Submitted: 10 months ago.
Category: Ford
Customer: replied 10 months ago.
we checked driver module it looks good not corroded
Customer: replied 10 months ago.
egr hose and elbow's look good
Customer: replied 10 months ago.
how long does this take ?
Expert:  Mike S. replied 10 months ago.

Fuel pressure over 130 psi? Are you sure about that? What engine is this?

Customer: replied 10 months ago.
5.4 I have put 2 fuel pumps in
Customer: replied 10 months ago.
can I get my money back I think this is a scam ?
Expert:  Mike S. replied 10 months ago.

You never answered my question about "Fuel pressure over 130 psi? Are you sure about that?"

Expert:  Mike S. replied 10 months ago.

JA isn't a scam, stop reading what people put on the internet who want you to think that.

Expert:  Mike S. replied 10 months ago.

130 psi is way too high

Customer: replied 10 months ago.
fuel pressure was over 130
Expert:  Mike S. replied 10 months ago.

It's only supposed to be 28-45 psi with the engine running and 35-45 psi with key on engine off.

Expert:  Mike S. replied 10 months ago.

is the engine still running lean with all that fuel pressure?

Customer: replied 10 months ago.
fuel pressure was 35 I put filter and pump in and checked it and was over130
Expert:  Mike S. replied 10 months ago.

fuel pressure was fine before.

Expert:  Mike S. replied 10 months ago.

Where did you get this pump, what are the psi specs on it or what is the brand name and model number or a link to where you got it?

Customer: replied 10 months ago.
what would cause it to be high with the next new pump
Expert:  Mike S. replied 10 months ago.

Where did you get this pump, what are the psi specs on it or what is the brand name and model number or a link to where you got it?

Expert:  Mike S. replied 10 months ago.

I cannot answer that until you answer me. If nothing has changed it must be the pump.

Customer: replied 10 months ago.
is very lean burning my eyes and has very little throttle response
Expert:  Mike S. replied 10 months ago.

What did you mean by "bowed fuel lines"?

if you bent a fuel line that could cause it.

Expert:  Mike S. replied 10 months ago.

Where did you get this pump, what are the psi specs on it or what is the brand name and model number or a link to where you got it?

Customer: replied 10 months ago.
ot pump frm auto zone it is a delphi
Customer: replied 10 months ago.
got pump from auto zone is Delphi pump
Expert:  Mike S. replied 10 months ago.

is this the flex fuel 5.4 or no?

Customer: replied 10 months ago.
I bowled out fuel lines with compressed air
Expert:  Mike S. replied 10 months ago.

they are the flex

Expert:  Mike S. replied 10 months ago.

Ok, blowed out. I get it.

Customer: replied 10 months ago.
flex fuel
Customer: replied 10 months ago.
pump is DFG0851 part number
Customer: replied 10 months ago.
it is 3rd pump we tried 2nd filter all was right size and all lines hooked up the same looked like right pump
Expert:  Mike S. replied 10 months ago.

perhaps you blew something down the line inside the fuel line and it got stuck and is now clogging up the fuel line causing both too high of a fuel pressure and not enough fuel flow coming through causing the lean fuel condition.

Customer: replied 10 months ago.
I took all lines of and checked they are all clear! Fumes might be coming out evak
Customer: replied 10 months ago.
evac
Expert:  Mike S. replied 10 months ago.

wait 1 minute, autozone is saying DFG0851 doesn't fit.

Customer: replied 10 months ago.
2008 F150 5.4 it looked same as the one that was in it
Expert:  Mike S. replied 10 months ago.

Do you know your wheelbase?

Customer: replied 10 months ago.
that is the pump
Expert:  Mike S. replied 10 months ago.

No wait a minute, I switched over to non flex assuming this was not flex because you never mentioned it before. Let me double-check.

Expert:  Mike S. replied 10 months ago.

Yeah, ok this fits. Sorry.

Customer: replied 10 months ago.
it is flex fuel
Expert:  Mike S. replied 10 months ago.

Now, back to the possible clogged fuel line. I would unhook both ends and see if you can blow air through the line only using a little pressure for now, like about 20 psi or so and go to the other end and make sure it is coming out.

Expert:  Mike S. replied 10 months ago.

I believe I was just reading yesterday how flex fuel vehicle fuel lines are lined with something because of the E85. Did you change any fuel lines or anything else, besides the fuel pump, as far as the fuel delivery goes?

Customer: replied 10 months ago.
did that again this morning can actually blow with mouth
Customer: replied 10 months ago.
just new filters
Expert:  Mike S. replied 10 months ago.

Where exactly are you testing the fuel pressure at?

Customer: replied 10 months ago.
vin number is *****
Customer: replied 10 months ago.
on the fuel rail
Expert:  Mike S. replied 10 months ago.

That vin is invalid and why are you giving it to me?

Expert:  Mike S. replied 10 months ago.

Is there any way you can check it closer to the pump?

Expert:  Mike S. replied 10 months ago.

What fuel are you using?

Customer: replied 10 months ago.
only line that might be kinked is the 2 little ones in inside the tank but I can also blow through them. Thought you could get wheel base from I number, I don't think I can no fittings for that
Customer: replied 10 months ago.
vin number was or wheel base
Expert:  Mike S. replied 10 months ago.

Is this new fuel filter a 3 port fuel filter?

Customer: replied 10 months ago.
chevron 87 always
Expert:  Mike S. replied 10 months ago.

First of all the vin I believe ends with 6 numbers, you have an d in there.

Expert:  Mike S. replied 10 months ago.

So that's gasoline, correct?

Customer: replied 10 months ago.
just one port in one out
Expert:  Mike S. replied 10 months ago.

Ok, is that what the old fuel filter had?

Customer: replied 10 months ago.
Expert:  Mike S. replied 10 months ago.

Well, that does it for me, I don't know what else to think but that is too much fuel pressure. I think I'll opt out, I don't know what else it could be causing that high fuel pressure and until that is below that 45 psi, I don't think moving onto anything else is ok for now.

Customer: replied 10 months ago.
do I get my money back mikes s could not help

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