Hey Guys,

I have search this forum till I am cross eyed and havent found a similar problem...

I have a 2000 F250, V10 5spd, Supercab-
74,000 miles

I drove it this morning and it ran great...I parked it in the driveway and hopped in my F450 welding truck and went out on a job. Got back this evening and got into the V10 and it wouldnt start- it rolls over but no start.

I checked #19 maxi fuse under the hood, a 20 amp for the fuel pump relay and it was blown- I replaced it and tried to start- same thing, it blowed that fuse....tried a 30amp- blowed it to. Went to the parts house and replace the relays under the dash (middle dash- small box with three relays) and then put new fuse under hood....it popped the fuse under the hood again.

I put the original relays back in the black box under the middle dash and just for grins put a new fuse back under the hood in the #19 slot----it blowed again when I tried to start the truck..


Could this be a bad fuel pump? What say all y'all????

This is my first Gas powered Ford- all the others are 7.3 PSDs- help me out here.

 

The only thing I can really say is that it sounds like you have an electrical "short" somewhere. It could be in the fuel pump itself or it could be in the circuitry leading back to the pump. Impossible to diagnose over the Internet and really tough to diagnose in person! I sure wish you the best of luck... I hate electrical problems.

 

I talked in length to the service mgr at the ford house in Longview, and he was perplexed by this too.

I have another friend that seems to feel as if the fuel pump has an issue but it seems really wierd that this truck was running fine when I parked it then 6 hrs later-Nothing, DOA.....wow (just m'luck!)

C'mon guys anybody ever heard of this one???

I just wonder if hooking it up to a 'puter will tell anything...I hate spending 'money for nothing when the checks aint free'...

Is it easier to lift the bed to access the fuel pump in the tank or just to drop the tank (It's easier to lift the bed on a chevy)

The MIL is on but does it stay on with the key on in the run position and a dead engine or should it go off if there isnt any codes?

I bragged on this truck today to my other diesel cohorts too...damntheluck!

 

That's what happens with fuel pumps. They run fine ... and then one day ... no start.

They usually just do nothing, not blow the fuse. But sounds like it's the pump.

Check the wiring going back there. If it were me, I'd check the resistance of the pump as close as I could to the tank. Anything lower than say .6 ohms will blow that fuse. Or a wire worn out and shorting to the chassis...

 

Update:

I got home this evening and unplugged the fuel pump at the tank- Fellas, that was a chore reaching in between the tank and the frame to get at that damn little plug.......

Anyways, I unplugged the harness and then put another new fuse in the #19 position in the fuse box under the hood. When I tried to start it the fuse didnt blow. I have a new fuel pump assembly in the floorboard for my chore in the morning.

I assume its easier to lift the bed than to drop the tank? The dang tank is full and I cant get a siphon hose down thru the bottom of the neck....guess thats a good thing, huh?

Damntheluck.

 

Congrats on diagnosing the problem so quickly!
If you have the means to do so, then I'd bet lifting the bed off is the easiest way to get at the pump. If you can't lift the bed up, then ya gotta find a way to drain that tank. Be safe!

 

Lifting the bed will be faster and easier IF you have some safe way to do it....

The last two I helped remove the bed on was a serious chore because the danged bed bolts were very verry very hard to remove.. in one case we had to grind the head off and remove the bolt after the bed was out of the way....

 

pretty sure that it is a short somewhere. might want to take it to ford

 

The few times I had to empty a gas tank, I just disconnected the fuel line at the fuel filter (after the filter), hooked up a hose to the end of the filter and using a Holley electric fuel pump from my Triumph TR7 days, pumped everything out of the tank.

I've done this four times, every time it worked great.

For me, alone, I'd rather drop the tank. I'm going to have to soon anyway, because I have an evaporative emissions hose broken somewhere and if I fill the tank up too much it comes pouring out under the vehicle

 

OK fellas...
I took the bed off, 7 bolts came out easy as a $2 dollar ho- The one bolt right above the fuel tank wanted to be cranky- but seeing as how I am the owner/proprietor/scapegoat of a welding service, i just backed my welding truck down beside the v10 and welded a 1/2 drive deep socket to the top of the bolt head. Those that attempt to do this at home remember- disconnect the battery so as not to spike the 'puter.(havin to change the fuel pump is bad enough)

Anyways, after I tacked the socket on top of that ol bolt I hooked my Ingersol 1/2" TNT impact to it and she come right out.

Later, I took the bolt and stuck it in the vise on my truck and took a cutting wheel and cut the tacks on the bolt, polished the bolt and socket with a 40 grit tiger disk and they were as good as new.

I then got My grandpaw on the front corner of the bed and my wife on the other corner...(She's bigger'n me fellas) and I got on the back of the bed right in the middle....That ol bed just come right on up and we took her to the back of the truck where grandmaw had layed down some rugs. I let the bottom rear corners of the bed lay on the rugs and we just tilted her right on up past a 45 degree angle and put a couple of prop rods under the front to hold her there.

I did the duty of removing the old fuel pump (1/07/00 was the date on it- so it was the original) and put the new one in- Then I put the new fuse back in the #19 hole in the fuse box under the hood, re-connected the battery (that also helped clear the memory so the ol v10 could re-learn a bit) and then after I instructed every one (to include the dogs) to cross their fingers- I cycled the key on and off a few times for the benefit of the new pump, then I hollered 'CLEAR!' and hit the key...........

She started right up.

I put er in gear and drove out the driveway and run down the road to the store, she run pretty dang good. I got me a coke at the store and took off for Longview so I could run by my shop and get a couple of things. I was cruising bout 75 down the road and every one was lookin at me and admiring my pretty green truck (some say it is blue). That ol v10 seemed to have ALOT more git up an go....

I was feeling pretty good about m'self and just sittin there listenin to the radio, checkin m'self out in the rear view and thinkin how good I must look when I noticed a cop car behind me with his lights on.

I pulled on over and rolled down the window, he walks up and asks me if I know why he stopped me....I assured him I was NOT speeding, I had the GPS to prove it.....He then proceeded to ask me if that GPS could prove I had tail lights and mud flaps.....I then realized I forgot to put my bed back on at the house....Y'all want to talk about bein 'caught up in the moment', I was damn sure caught up in it!

I swallowed my pride and my self serving attitude about m'self and started esplainin to the deputy about what had happend, I told the WHOLE story....
Well, fellas, I am here to say that after an escort back to the house with a stop off enroute via the ez mart for my new friend a cherry slurpee, I didnt get a ticket.

Hope this info helps any of y'all that ever experience this sort of thing....

\be seein y'all.

 

And I thought you were being pulled over because you didn't have mud flaps

 

glad you fixed it. great story how you got out of the tickey

 

ok fellas....one more observation.

when I got the truck running again and during my first excursion out on the road minus the bed, lol- I would say I drove approximately 5 miles. Now, in my estimation that would be around 20 minutes of run time on the motor.

Anyways, when I got back to the house and shut it off, I re-installed the bed and then after a wipe down I took off again...I made it out of the driveway and the truck stalled out and died....

I opened the hood and checked the fuse and ALAS! it was blown.

I put a new fuse in the #19 hole under the hood and took off again.

I drove back into town and stopped at orielleys and bought some more new fuses to replace the ones that I had robbed when the truck first went down.

As I got to the edge of town (keep in mind I am nearing that 20 minute runtime window) the truck stalls and dies...hmmmmm

I all my grandpa to come and get me off the road and I am sitting there trying to figue out if it's a short..... For grins I open the hood and check the #19 fuse and it doesnt 'appear' to be blown, but I swap it for one of the factory fuses that was originally in the truck.

Grandpa shows up and pulls me into the parking lot and I try to start the truck and ...wow, it starts.


I bet I put an hour of run time on the truck and it didnt stall or blow the factory fuse.....I then put another orielly fuse in the #19 hole and take off and about that '20 minute runtime window' it blows....I put the 'factory fuse back in and run it for 124 miles- flawless.

I swap for another orielly fuse and, yep it blowed...go figure.


Now, I aint never been accused of bein mentally stable but how is it that I went through 8, 20 amp, maxi fuses from oriellys and blowed every one of em? But one of the original fuse of the same amperage was used between the blown ones from oriellys and it hasnt given up yet........

I know I had a bad fuel pump to start with because before I isolated the pump, it was blowing those good 20 amp fuses....but is it possible that not all fuses are the same breed? LOL

 

Hey Longview Texas brother

You have a high resistance in the system and I suspect it is one or more of the battery grounds...find each and every ground to the motor and frame you can find and clean them up

Yes different brands of fuses have different internal resistance and some blow faster then others...but your 20 amp fuel circuit should NOT be pulling high amps right in the range for blowing the fuse... you might want to check back at the pump if you are getting the right VDC.... that far back you should see less then 1 VDC drop from what is found at the battery.... say at idle you measure 13.7 at the battery the minimum you should measure at the pump connector is 12.7VDC.... if less it can be weak ground or weak corroded Positive side..... lower VDC will draw higher amps in the circuit

My experience is that the grounds get corroded and cause this type grief.... just the act of removing and reinstalling makes for a better ground---but better to use a bit of scratch pad, croucous cloth, or sand paper and get a good metal to metal connection