I posted a while back about the truck having problems and stalling frequently. I'm convinced its a fuel issue but I just don't know enough to narrow it down. 89 F150 XLT Lariat 5.0 302 with dual tanks. As suggested in my previous thread I changed the fuel pressure regulator, O2 sensor, fuel filter, and prior to that have changed EEC and FP relays, ignition coil, and I think that's it. Now I know my sending units don't work so I never know how much gas is in the tanks but I always keep gas in both just to be safe. After sitting for a month then changing the regulator and O2 sensor it ran fine for almost a week, then started stalling again while driving. The past few times it's sputtered, no matter which tank I'm running on, sometimes it'll pass, most of the time it stalls. Sometimes I can crank it right back up and get to drivin again, sometimes, like this most recent one, it took about an hour before I could get it to start again. Whenever I turn it into the on position and check the pressure on the fuel rail, it pisses out hard then ends in a dribble. I'm not a mechanic but I imagine it should be pressurized the whole time and steady ****, right? I'm thinking maybe my high pressure fuel pump could be shotty? It'll crank right up when it's cold no problem, when it's been running a bit, either just down the road or 30 miles down the road, it seems to have this issue. Not sure what else to say, but any help would be appreciated, I'll try to answer any questions that may lead to help as well.

 

You need a fuel pressure tester. You can rent one or buy one at autozone or advanced auto. You need to see if it holding pressure. From the sounds of it though it is time for new pumps.

Have you confirmed spark when it stalls? If not start there. The ignition module, coil, or pip could be failing when the truck warms up.

 

Where exactly is the ignition module located? Someone else mentioned that in conversation and I haven't been able to find it. I know where the coil is, where is it in relation to that?

 

it's located on the side of the distributor.

 

Alright, that was easy to find once I realized my mistake. I was looking for the kind used in older models with the two plugs that come off it. I'll get that and pressure tester from Autozone and see where I get from there.

 

With the distributor, am I able to just lift it up without harming anything, or does it matter? If I can lift it up, how much room do I have to work with?

 

No man, mark the distributor first. I would put cylinder 1 at TDC on compression stroke and then mark BOTH the body of the dist and where the rotor is pointing (which will be plug 1 cause you put it at TDC).

You can just pull the dist out without putting it 1 at TDC, but just mark the body and where the rotor is pointing. Also note where the rotor ends up after pulling the dist out cause it moves and you will need to start it there to put it back in to the correct point. Hope this makes sense. Basically you want to mark body of dist to point on truck so you can line it up. You want to mark where the rotor is pointing. You want to pull dist up, but mark where the rotor moved to. To install just line up body mark and where rotor ended up when you pulled it. It should fall to the point where you marked the rotor. It should go in EXACTLY as you removed it.

Hope this helps.