cutting out - update . . . sorta
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Laughing Gas
Joined: Nov 2002
Posts: 1,143
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cutting out - update . . . sorta
If you remember in mid-January, I had problems with the truck cutting out from idle and when driving. Here's what's new: I reset the computer and got it on the road today. The cutting out is almost gone. By this I mean that I can get it up to 80 mph and there is a small (yet noticeable) amount of cutting out. Happens mainly when you press on the gas. Still feels like I'm pulling something. High pressure fuel pump is still loud. When tested last month, the fuel pressure was at 31 psi.
From doing a lot of reading on this site I've come to the conclusion that it's a fuel issue. The h.p. fuel pump is probably sucking air in somehow. I'm thinking that dropping the tanks and replacing in-tank pumps and seals is the answer. Anyone think that is right/wrong? Anything else I should check?
From doing a lot of reading on this site I've come to the conclusion that it's a fuel issue. The h.p. fuel pump is probably sucking air in somehow. I'm thinking that dropping the tanks and replacing in-tank pumps and seals is the answer. Anyone think that is right/wrong? Anything else I should check?
Tuned
Joined: Mar 2003
Posts: 394
Likes: 10
From: austin
Have you checked the dual function reservoir yet? It's in the frame rail between the tanks and high pressure pump, has 4 lines to/from the tanks and 2 lines to/from the engine. If it's clogged, it may be responsible for not getting enough fuel to the HP pump. I'm almost certain that this part is causing me problems on my '86 302 right now, but you have to get the replacement from the dealer. If that's your problem, it's at least a lot easier to replace than the in-tank pumps!
TM
TM
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Joined: Nov 2003
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From: Over here
88grandmarquis, I just replaced all three of my fuel pumps. The high pressure pump started out loud and has since got a lot more quiet, the pump is a vane type and when new will make noise but should make less as you run it, unless you "are" sucking air from somewhere. When I pulled rear tank pump the rubber connector from pump to line had blown apart,rotten. If you run low enough on fuel it might be pulling air from this, (fuel level below rubber connector). If the tank selector valve does not switch all the way and say you are on front tank the valve may let air pass that it is getting from back tank even if there is no power going to back pump. Hope this helps.
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Laughing Gas
Joined: Nov 2002
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I was thinking that it could be sucking air from a hole in the line. The pickup was parked for a year with empty tanks and since then it's had this problem. I've read before that the lines can rot out.
Timken, was the line that rotted out inside the tank or outside the tank?
Timken, was the line that rotted out inside the tank or outside the tank?
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Laughing Gas
Joined: Nov 2002
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One more question: I called around for parts prices today. Did you replace just the in-tank pumps or the entire hanging unit? Can the rotted out lines and just the pumps be replaced without doing the entire hanging unit?
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From: Over here
I replaced just the pumps. The connector line is only about three inches long, its in the tank, connects the pump to the hanging unit. Don't overtighten the pump nuts the studs are made of brass and will bend. I bought NAPA parts they were made by Carter, $55.00 tank pump. Cost may be high but I have never had to take back parts like I have from other parts places because they give me the right part the first time. The org. connector line was soft foamy like rubber that blew out to the side the replacment connector is like good fuel line with aviation clamps, org. did not have clamps. Front tank was easy to slide on using full length, back one I had to cut, not much room between pump and end of line also used some Armor All to help slide on.
For safety be sure the ing. switch is OFF. or disconnect the battery, you "will be" working around an open fuel tank,have fresh air in and out if inside a building. Just a friendly reminder, I sometimes take chances cause I'm "in a hurry" so much to do and all....then I think........what if?
For safety be sure the ing. switch is OFF. or disconnect the battery, you "will be" working around an open fuel tank,have fresh air in and out if inside a building. Just a friendly reminder, I sometimes take chances cause I'm "in a hurry" so much to do and all....then I think........what if?
Last edited by Timken; Feb 16, 2004 at 12:37 PM.
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Tuned
Joined: Mar 2003
Posts: 394
Likes: 10
From: austin
The selector valve is about a foot behind your high pressure pump. It's black, has 4 fuel lines in the back and 2 in the front. The outside of the driver's side frame rail will have two bolts - that's all that holds the unit to the frame rail. If you take it off, jack the truck or park on an incline so that the front is higher - otherwise the 4 lines from the tanks will leak forever.....
TM
TM
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