Truck will not start. Neither fuel pump will run. I have ran a hot wire to both pumps and they will both run as long as a hot wire is attached {to the battery},but that is unsafe. The rollover switch seems fine and was not tripped.I changed the fuel pump relay. The fuel tank selector switch seems to be working fine. On the fuse panel diagram, it does not show a fuel pump fuse... Does this model have a fuel pump fuse? My truck is a 1989 Ford F250-5.8 liter{Lariat}. 2 wheel drive W/duel fuel tanks and fully optioned. Thanks for your help!
Hey lets try this ! Locate your starter solenoid & look for a yellow wire marked with a "W" . That may be the fusible link for fuel pump. Let me know what you find.
what do i do when i find the yellow wire
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relay switch gets the fuel pump running in the vehicle during the start
cycle. The terms fuel pump relay and fuel pump relay switch are used
interchangeably. The fuel pump relay begins its job when the automobile
operator turns to the ignition on, but before the motor is actually
running. At that point, the fuel pump relay in some cars sends a signal
to the ignition switch, which in turn sends a signal to the fuel pump
to turn on. Others fuel pump relays have actual circuitry inside of
them that receive the ignition signal and directly signal the fuel pump
to engage.1,135 views
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Sorry, But i'm not really sure what a fusible link even looks like, nor would i even know where to look.
I hav'nt even been able to find a fuse for the fuel pumps.
ME, I've tinkered with old cars for years, But nothing with fuel injection. I own a 1969 SS Nova that i race and it has an electric fuel pump. But that is a far cry from today's tech. I found the rollover switch in the original owners manual. It also mentioned fuel pump relay's. There are six relay's located beneath the hood on the drive side. None of which are clearly marked. So i pulled all of them, Took them to work, And had my electricians test continuity. They assured me that all of them were good,{testing them with a 12V fluke ampometer}. I have hooked up enough elec fans,radios,fuel pumps;etc to know how to hot wire. Sorry for the confusion, I know what a fused link is... I just dont know what it may look like on a ford and where to find it. This truck has only 43,000 orig miles and is very clean. It has been in my family since new, So i know it has'nt been tinkered with,ie;radios,electronics;etc. I appreciate all of your help. Thank's.
I can give you my cell number if it will help?
Big Block! I see only one fuse panel, where could the other panel be? I'll keep looking for those fusible link's and get back with you tuesday morning.Thank's for the help.
Could not locate anything resembling fusible links, nor could i find a lone fuse for these pumps. Surely these pumps have fuse protection? This is driving me nuts. Guess i'm going to have to pay a garage $75.00 an hour to remedy this headache. Thanks for all of your help. Silas
I'll dig a little more for exact location on yours and see what I can come up with, maybe a picture.
Big Block, Nicer yet! Sorry about mixing you up on fuse panel(s). You probably only have the one, I was working on a Caravan post around same time, they have 2. Keep me posted. By the way, just double check all ground straps, connection etc, that you see under hood just in case.
O.K. good. 69' Nova, nice !! Big block or small block?
Anyway back to your problem. Surprised relays aren't labeled, underside of cover at least. Have you checked all fuses in both panels with test light,key on, regardless of what they say they're for, just in case they are labeled wrong? As far as fusible links go, if memory serves me well here, on that model truck, I believe they are attached to + battery terminal with a heavier gauge wire, and then from there they branch in to numerous wires. The coating on these wires feels softer kind of, more spongy rubber, and when you bend them, the wire stays in that position better. (sounds dumb, but you'll see what I mean) These are the fusible links. It's basically a piece of wire that acts as a fuse. You have to feel along (wiggle up & down) for a spot that feels like wire is broken under rubber coating. If you think you feel it, use test light on both sides of the area and see what you get. Sometimes they can be a pain, other times you can feel it right away. My guess is that one or more of the links (wires) are yellow. Check the yellow one(s) first, you might get lucky. Let me know how you make out.
O.k. No Problem. Let me ask you this, and please don't take it as sarcasm, it's not meant to sound that way, if it does. How did you arrive at the conclusions that the have already, regarding rollover switch, pump relay, etc? Who knew enough to run a hot wire?
Link may be labeled "W"
Have you checked for bad fusible link that supplies power to fuel pump relay. Probably a yellow one?
Not sure what else to try. Crankshaft sensor? Fuel pump relay? will it be fitted with a solenoid that could be sticking when it gets turned off when hot?
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