fuel pump fuse keeps blowing

[cutthroatxxx]

Its not the pump.This is the 3rd new pump

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[Dantheman]

Even if the flow increases, the pressure stays the same unless the pump can't keep up. The load would decrease if it lost pressure.

 

[cutthroatxxx]

So let me ask this.Should I pay this fella to come check the wiring or shouldbI just buy ohm reader? And do it myself?

 

[cutthroatxxx]

Just talked to the mechanic he says he has noway 2 read the fuel.pressure but it should be 2500lbs @the.injectors..that dosnt sound right.

 

[ghohouston]

you just need to know the pressure at the fuel bowl, not the injectors. you need 55ish lbs at the bowl, under load, not just at idle.

 

[Arisley]

That mechanic doesn't know about Powerstrokes. The fuel pressure increase happens inside the injector.

If you know how to use an ohm meter, get one yourself and check the wiring.
Every tool box needs a multimeter.

 

[mandkole]

As said, a full review of the wiring and fuel system is needed. You need meters, gauges, etc. Since this truck was sold with unknown issues you could have restrictions in the fuel plumbing, hacked wiring, etc.. The joys of getting someone elses junk..

Where are you located? Perhaps some help is in the area..

 

[cutthroatxxx]

Im in missouri in a.small small.small town in.franklin county

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[mandkole]

dont know anyone there... but we have plants in Poplar Bluff, Versailles and Columbia

 

[AzPsd55]

I would pull the fuel bowl, clean it all up make sure everything is flowing good, then check the check valves in the head just like arisley said. make sure nothing's clogged up. You might want to drop the tank and blow out the incoming and return just to be sure. I know its a pain but then you can rule out flow issues.

 

[cutthroatxxx]

Im about 2&1/2 hrs away.from each of those places.Im.past 6 flags,Weve blown the bowl out as well as all the lines.When I pulled the.mixing chamber it was.pretty clean.Not that this might have anything to do.with it but my shifter linkage hae slack in it.When u go.to fire it u have to push&hold it up.

 

[AzPsd55]

iirc theirs two filters inside the white part of the sending unit you could clean i know that would make the truck run sluggish, but i don't think it would make your fuse pop.

 

[cutthroatxxx]

Ive eliminated them.My question now is.How.am I suppose 2 hook up a gauge 2 read fuel pressure since the fuel pump fuse blows so fast?

 

[mandkole]

iirc theirs two filters inside the white part of the sending unit you could clean i know that would make the truck run sluggish, but i don't think it would make your fuse pop.

As I understand it, the DI tank mod kit should remove the parts between the umbrella and the top of the sender assembly. Im still puzzled why the bowl has enough pressure in it to cause to blow fuel out the drain under pressure. Ive never seen it , so if someone can confirm this is normal for stock SD fuel bowls, then I'll stop bringing it up. OP, after the fuse pops is the pump noticably warm or hot? can you tell? That maxi fuse has had over 20 amps back feeding through it so something is getting warm.

Cutthroat, start looking at wiring for strange taps, etc. and lets try to confirm what the fuel pressure is doing.

 

[mandkole]

Ive eliminated them.My question now is.How.am I suppose 2 hook up a gauge 2 read fuel pressure since the fuel pump fuse blows so fast?

there is a test port on the bowl-- a harbor freight gauge with a 5 foot hose on it will work. put it somewhere you can see it from outside the hood.

 

[AzPsd55]

 

[Arisley]

View attachment Fuel.pdf

Item 4 is the valve I am talking about.

 

[cutthroatxxx]

I can order.the adapter to run into the port from guzzlers page&can get a gauge but what Im confused on is how to get a correct reading since the fuel.pump fuse blows the pump wont be working so I wont get a correct reading.Lastnite it blew while idleing.Itll.blow a 40.amp.fuse it just takes.a minute longer.Ive blown over 100 bucks worth of em

 

[cutthroatxxx]

 

[Arisley]

Just test it with the key on, engine off.