Fuel pressure

MBRPCrazyford · Oct 16, 2007

Had the truck at the shop for a few issues. While there they tested the fuel pump. It tested at 50 at idle and 40 at wot. He siad the it should be at about 60-70 at WOT. What are the normal pressures?? Also, where are the tranny coolers on these trucks?? Any help would be great, Thanks.

BlueMule · Oct 16, 2007

The fuel pressure is preset at 46 psi but a lot of guys like to bump it up to around 60 to insure that the injectors get their fill of fuel in the alloted time.

There are two tranny coolers in series. First it goes through the oil to water cooler in the bottom of the radiator and then it goes through the oil to air cooler that's just behing the grill.

MBRPCrazyford · Oct 16, 2007

ok, thanks, the guy tells me that the fuel pump may need replaced in the near future. How do you bump it up to 60, and can the stock pump do this??

hheynow · Oct 16, 2007

Very easy and it's OK for a stock setup. It's called shimming the fuel pressure regulator. On the FPR is a brass 3/4" cap screw. Remove it. You'll see a spring and a sleeve. Remove the spring from the sleeve and drop in a 3/16" ball bearing and replace the spring in the sleeve. This will increase the fuel pressure.

MBRPCrazyford · Oct 16, 2007

ok, thanks, as for needing a new pump, what do you think?

hheynow · Oct 16, 2007

Is the fuel pump weeping? Is there a pool of diesel in the valley? Increasing the spring pressure in the FPR won't correct a failing pump, but those psi numbers indicate a working fuel pump.

MBRPCrazyford · Oct 16, 2007

Ok, thanks. No it's not, and there is no pool, thanks for the help!!

BlueMule · Oct 16, 2007

If he is trying to sell you a new pump based on the 50 psi at idle and 40 psi at wot he's just trying to get your money and you should start looking for a more trustworthy mechanic.

MBRPCrazyford · Oct 17, 2007

Yeah, I know, first time I used him and people I know have had great service from him, but I don't think I'm goin back.

Fuel pressure

MBRPCrazyford

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BlueMule

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MBRPCrazyford

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hheynow

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MBRPCrazyford

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hheynow

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MBRPCrazyford

Eat Some Smoke

BlueMule

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MBRPCrazyford

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