Fuel Pump Relay??
Thread Starter
|
Senior User
Joined: Jan 2005
Posts: 113
Likes: 0
From: Portland, OR
Fuel Pump Relay??
'89 E350 with 351W.
Died. Towed home 2 times. Got spark to plugs. No elec to external fuel pump. No elec to inertia switch. Any idea where the fuel pump relay is in this rig? Or am I barking up the wrong tree? Have not tried to check power to intank pumps, I stopped when I checked external (on rail) pump.
Died. Towed home 2 times. Got spark to plugs. No elec to external fuel pump. No elec to inertia switch. Any idea where the fuel pump relay is in this rig? Or am I barking up the wrong tree? Have not tried to check power to intank pumps, I stopped when I checked external (on rail) pump.
Senior User
Joined: Jan 2005
Posts: 216
Likes: 2
If you are not getting power to the inertia switch then you blew a fusible link. Check out this schematic, it is for an 85' truck but should still be the same on you van.
http://www.ddeboer.com/fordtruck/pag...20Tank_gif.htm
Most fusible links are within a foot or so of the starter relay, where ever that is on you van. It will look like a plastic block on the wire. Good luck.
http://www.ddeboer.com/fordtruck/pag...20Tank_gif.htm
Most fusible links are within a foot or so of the starter relay, where ever that is on you van. It will look like a plastic block on the wire. Good luck.
Thread Starter
|
Senior User
Joined: Jan 2005
Posts: 113
Likes: 0
From: Portland, OR
I am trying to incorporate the truck schematic with the Chilton engine schematic I have for '89 5.8L. It doesn't seem to make a lot of sense. What is the best way to test a fuseable link?
Senior User
Joined: Jan 2005
Posts: 216
Likes: 2
I am not familiar with the vans, but most things operate basically the same.
Anyway, a fusible link is just a smaller guage wire that will burn if there is to much current passed through it, the insulation block is there to keep it from starting a fire. You want to check the wire for continuity, use a volt meter or test light and make sure that the connection is not broken inside. I just strip a small amount of insulation on each side of the fusible link and touch the wire. You can also find the connetor at either end and check for continuity.
Anyway, a fusible link is just a smaller guage wire that will burn if there is to much current passed through it, the insulation block is there to keep it from starting a fire. You want to check the wire for continuity, use a volt meter or test light and make sure that the connection is not broken inside. I just strip a small amount of insulation on each side of the fusible link and touch the wire. You can also find the connetor at either end and check for continuity.
Thread Starter
|
Senior User
Joined: Jan 2005
Posts: 113
Likes: 0
From: Portland, OR
Let me rephrase that, I don't got it. I could only find two fuseable links, one on the negative post that looks like it deals with my trailer/hitch stuff, and one that doesn't go to the fuel direction that is OK anyway. So, at this point, I am stumpped again. I have taken all of my dash apart tracing wires, but when they go into major harness, I lose them. Regardless, there are still only two fuseable links under hood. Is it possible that there could be some kind of junction that has a fuse in it?
Senior User
Joined: Jan 2005
Posts: 216
Likes: 2
I did some research and it looks like the vans are a little different then the trucks, sorry.
But you do have a fusible link that goes to your fuel system, it just might be deeper into the system and could still be the problem. It should be a yellow wire up to the fuel pump relay and then the power output wire to the inertia switch will be an orange wire with a light blue stripe. After the inertia switch there should be a pink wire with black stripe that powers the pumps.
Your pump(s) only get power when you are starting and then when the engine is running. Most engines have some sort of oil pressure shutoff switch, but I don't see one on this schematic (doesn't mean you don't have one for sure). It might be that your computer isn't sending the signal to the pcm power relay to tell the fuel pump relay that the engine is running.
Hopefully this picture works, if not, it should be the same wiring schematic as in your book. (I got it from the autozone website) Good luck
[img]file:///C:/Documents%20and%20Settings/Tina/My%20Documents/My%20Pictures/0900823d801775af.gif[/img]
But you do have a fusible link that goes to your fuel system, it just might be deeper into the system and could still be the problem. It should be a yellow wire up to the fuel pump relay and then the power output wire to the inertia switch will be an orange wire with a light blue stripe. After the inertia switch there should be a pink wire with black stripe that powers the pumps.
Your pump(s) only get power when you are starting and then when the engine is running. Most engines have some sort of oil pressure shutoff switch, but I don't see one on this schematic (doesn't mean you don't have one for sure). It might be that your computer isn't sending the signal to the pcm power relay to tell the fuel pump relay that the engine is running.
Hopefully this picture works, if not, it should be the same wiring schematic as in your book. (I got it from the autozone website) Good luck
[img]file:///C:/Documents%20and%20Settings/Tina/My%20Documents/My%20Pictures/0900823d801775af.gif[/img]
Trending Topics
Senior User
Joined: Jan 2005
Posts: 216
Likes: 2
doesn't look like the picture worked, got to go figure that out. But you can see the picture if you go to www.autozone.com and on the left side click "repair info". You want to find your way to chassis electrical.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Senior User
Joined: Nov 2004
Posts: 191
Likes: 0
my 87 ev troubleshooter says check fuse link at starter relay. then check grounds are clean and tight at g112(lh side of dash panel) g203(on ground bus at left hand side of y brace). the last one grounds the fuel system i think. its hidden at the bottom of the LH y brace on its left side. hope this helps.
it mentions to check fuel pump relay but gives no location. the fuel pump cut off relay is on the left hand side of the dash.
it mentions to check fuel pump relay but gives no location. the fuel pump cut off relay is on the left hand side of the dash.
Senior User
Joined: Oct 2003
Posts: 321
Likes: 0
From: Metamora
The fuel pump relay on my 91 E150 is on the inner fender on the passenger side. It is covered by a black plastic shroud that is bolted to the inner fender with two sheet metal screws. The shroud holds the EEC relay and Fuel Pump relay. The fule pump relay should have a green connector and the EEC relay should have a black connector.
I had the fuel pump relay go bad on my 90 F350, replaced it with the one from my van and it fired right up. I'd check the relays first if I were you.
The replacement fuel pump relay is < $10.00 at the parts store.
To be sure if they are working, you should be able to hear them clicking if you can have a helper turn the key (not to start, just ignition on).
If I remember, I'll try to take a picture of the relay tonight and put in my gallery.
I had the fuel pump relay go bad on my 90 F350, replaced it with the one from my van and it fired right up. I'd check the relays first if I were you.
The replacement fuel pump relay is < $10.00 at the parts store.
To be sure if they are working, you should be able to hear them clicking if you can have a helper turn the key (not to start, just ignition on).
If I remember, I'll try to take a picture of the relay tonight and put in my gallery.
Thread Starter
|
Senior User
Joined: Jan 2005
Posts: 113
Likes: 0
From: Portland, OR
Thank you all very much!
Not knowing what these relays did, but guessing, I have already replaced both of the relays mentioned by 86RUSTBUCKET. So that is not where the problem lies. I'm thinking that it could be in the PCM, (computer/brain). I can't find a fuse-link that connects to the fuel system, unless it's hidden behind the speedo-guage panel of the dash. I'm having a problem getting the speedo cable undone to check. However, if the problem is in the PCM, that would be much more easy to test. Does anyone know how to test it, or can it be tested??
Not knowing what these relays did, but guessing, I have already replaced both of the relays mentioned by 86RUSTBUCKET. So that is not where the problem lies. I'm thinking that it could be in the PCM, (computer/brain). I can't find a fuse-link that connects to the fuel system, unless it's hidden behind the speedo-guage panel of the dash. I'm having a problem getting the speedo cable undone to check. However, if the problem is in the PCM, that would be much more easy to test. Does anyone know how to test it, or can it be tested??
Senior User
Joined: Nov 2004
Posts: 191
Likes: 0
fordfuelinjection.com has alot of info on codes and eec info. they say code 95 "infinite ground" sensed by the eec from the fuel pump. i think there is a ground at the in-tank pump that can come loose. worth a shot if you've check everywhere else. i remember a post were someone while replacing a fuel pump noticed the ground was loose and was causing his issue. good luck.