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Hey all, does anyone know where the fuel pump fuse for the 1988 Ford Aerostar is?
I've been having some problems with the fuel pump. Thing is, it may not be a problem with the fuel pump, and could just be a bad connection somewhere between the battery and the pump.
Battery is fine, inertia switch is pushed in, but fuel pump isn't working. Only reads 6 volts running to the fuel pump, when it should be about 12 volts, I assume.
Been checking all connections between the battery and pump, but couldn't specifically find the fuel pump fuse. Anyone have any ideas?
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BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee
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If you're getting some voltage then the fuse is fine, if there even is one for the fuel pump on that model. The fuel pump relay could be bad causing the low voltage.
Check the EGR sensor. That relay could also be suspect, either CarQuest or the dealer. AutoZone and Advance do not carry it. NAPA might have it but they are always closed.
On the relay, one of the larger pins should have 12v when key is on, one of the smaller pins is the coil hot, it comes from the EEC thru the EGR to the impact switch and on back...
Tonyhartwig is right, about the fuse.
I just answered your question without thinking.
The ground is just as important as the power line, so be sure to check both.
Here is a list of ground locations for a full size bronco, I suspect that they are similar for the bronco 2, ranger and aerostar. In particular look for the one near the fuel pump on a crossmember.
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BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee
At the bottom of each post there is a little icon
Clicking it gives feedback to the moderators, and poster regarding which posts are most helpful.
Good call guys, looking around some more, I don't even think this model has a fuse for the fuel pump, which evidently wouldn't have even been the problem. The relay was making some unusual clacking noises that I've never noticed before, I'll be checking it next, as well as the other great suggestions you all have mentioned.
I'll give an update if I can figure out where the problem is originating from. Thanks again for all the great responses!
__________________
BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee
At the bottom of each post there is a little icon
Clicking it gives feedback to the moderators, and poster regarding which posts are most helpful.
Check the ground wire that connects to the fuel pump using a meter set on resistance. Put one end on wire and the other end on the metal chassis somewhere. It should read zero or real close to it. The fuel relay is supposed to click twice when you turn the key into the 'on' position. It clicks once to prime the fuel pressure then another click shuts it off, all within a few seconds. The charcoal canister purge solenoid is wired in-line part of the voltage that energizes the relay to switch on the fuel pump so it could be that but I dout it. My dad owned an 87 Aerostar and I had the same issue with noisy relays on those models but it turned out to be a bad fuel pump so if all else fails you could replace that if you havent already. Here's a wiring diagram if you know how to read them. http://econtent.autozone.com:24991/z...528006de68.gif
Last edited by adrenochrome; 10-14-2008 at 11:42 PM..
Thanks for the relay testing method Broncojoe, and thanks adrenochrome for the wiring diagram and pointers. We ended up opening the relay box and at least one of the relays seems to have been damaged somehow and wasn't moving into the right position, not sure how that happened. Not entirely sure which relays are for which parts, but we'll be fixing and replacing them to see if it solves the problem.
Certainly hope it isn't a bad pump. As I understand it, changing out the pump is going to be difficult, or it could cost quite a bit if we send it to a garage. We'll see if that'll be necessary. Thanks again for all the great suggestions, with the help that you all have given we've really narrowed down what the problem could be.
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Where is the Fuel Pump Fuse on 1988 Aerostar? 
Linear Mode
