Fuel pump causing hesitation?
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Fuel pump causing hesitation?
Hi there,
I am new to the forum and looking for some advice. I have a 93 F-150 with a 5.0L and dual tanks. I am having a high rpm hesitation, bucking and general lack of power. It runs bad on the rear tank and even worse on the front tank. When the tank selector is switched during higher rpm's it bucks violently. It's been to the local mechanic 3 times and the dealer once. Each time it came back it ran great for a day or two, then back to the routine. The filter has been replaced twice and the Ford dealer replaced the check valve and fuel pressure regulator as part of the recall. Still the problem. So today I replaced the IAC for the cold start idle surge, and did new plugs, wires, cap and rotor. Didn't solve the problem. The local mechanic said this system has a fuel pump in each tank, and that the front one is going bad...only 18 psi. Would this cause the problem even when I run off the rear tank? The plugs came out a light grey color...lean? I was going to replace the front pump next. Any suggestions?
Thanks
I am new to the forum and looking for some advice. I have a 93 F-150 with a 5.0L and dual tanks. I am having a high rpm hesitation, bucking and general lack of power. It runs bad on the rear tank and even worse on the front tank. When the tank selector is switched during higher rpm's it bucks violently. It's been to the local mechanic 3 times and the dealer once. Each time it came back it ran great for a day or two, then back to the routine. The filter has been replaced twice and the Ford dealer replaced the check valve and fuel pressure regulator as part of the recall. Still the problem. So today I replaced the IAC for the cold start idle surge, and did new plugs, wires, cap and rotor. Didn't solve the problem. The local mechanic said this system has a fuel pump in each tank, and that the front one is going bad...only 18 psi. Would this cause the problem even when I run off the rear tank? The plugs came out a light grey color...lean? I was going to replace the front pump next. Any suggestions?
Thanks
Last edited by mikal1; Aug 19, 2004 at 03:17 AM. Reason: mistake on year
Logistics Pro
Joined: Apr 2004
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From: NJ where fun comes to die
Welcome to FTE. I believe there was a recall on the fuel pumps on dual tanks including 93. One tank would pump into the other. I know it included 92, because I had a 92 and Ford replaced both pumps. Do a thread search about it. You might come up with more info. Good luck with it.
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The recall was for a defective check valve which allowed fuel to be pumped from the rear tank to the front tank. Which caused the front tank to overfill and spew allover when the cap was removed. Ford replaced a check valve and the fuel pressure regulator.
Update: It's now been to the local mechanic for the forth time. He believes that a couple of fuel injectors are causing the problem. He said they ohmed out ok, but suspects they are clogged. To clean them all costs $350. He says the cost new is $108.00 each. Meanwhile it still bucks, hesitates and lacks power at higher rpm's.
Update: It's now been to the local mechanic for the forth time. He believes that a couple of fuel injectors are causing the problem. He said they ohmed out ok, but suspects they are clogged. To clean them all costs $350. He says the cost new is $108.00 each. Meanwhile it still bucks, hesitates and lacks power at higher rpm's.
Elder User
Joined: Jan 2004
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From: Franklin, GA
Just a shot in the dark here, but......
At cruising speed, without a load (not pulling a hill or during acceleration), hessitation or skipping can be caused by a malfunctioning EGR valve. Worth a check before you "dollar" yourself into the poor house hunting the problem's source. Good luck.
At cruising speed, without a load (not pulling a hill or during acceleration), hessitation or skipping can be caused by a malfunctioning EGR valve. Worth a check before you "dollar" yourself into the poor house hunting the problem's source. Good luck.
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Joined: Dec 2001
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From: Louisville,Ky.
[QUOTE=mikal1]The recall was for a defective check valve which allowed fuel to be pumped from the rear tank to the front tank. Which caused the front tank to overfill and spew allover when the cap was removed. Ford replaced a check valve and the fuel pressure regulator.
That's what the 95 F150 is doing.
My Dad's 89 does this too, but it needs a new switching valve.
That's what the 95 F150 is doing.
My Dad's 89 does this too, but it needs a new switching valve.
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Junior User
Joined: Oct 2002
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From: Pagosa Spring USA
I have a 95 F350, 460ci with the same problem you described on this forum. My back tank pumps into the front tank. I discussed this over a two-week period with my local Ford dealership and allegedly with the regional rep but their attitude was "Get out of my face." A complaint at National Highway Transportation Safety Agency (nhtsa-dot-gov)is next. If they don't want to fix my truck, they can fix all of them. BTW, the NHTSA number for the 90-93 recall for the same problem is 93V125000. And, one check valve from the 90-93 recali is $250. Yeah, right.
May I ask what you eventually did to solve your problem? I can install a new pump but I'm not sure where the check valve actually is. Nor can my local Checker slash NAPA guys. The FDM is $100 more expensive than just the pump ($150 @ checker) and I am cost sensative about this., I shouldn't even have this problem.
May I ask what you eventually did to solve your problem? I can install a new pump but I'm not sure where the check valve actually is. Nor can my local Checker slash NAPA guys. The FDM is $100 more expensive than just the pump ($150 @ checker) and I am cost sensative about this., I shouldn't even have this problem.
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From: Louisville,Ky.
I am in the process of repairing a 95 right now. I went to Autozone and bought the fuel pump module for the front tank. Weather permitting, I will be installing it tomorrow. The rear tank has over 40psi and runs good, but pumps into the front tank. The front pump only has about 17psi and barely runs. I used the bleed-off valve on my fuel pressure tester while jumping out the relay and pumped most of the gas out of the tank. It took awhile (almost full) and got late so I plan on dropping the tank tomorrow. The new module for the front tank is about $150.
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From: Pagosa Spring USA
LxMan1, was your rear tank pumping into the front tank in addition to having low pressure also? I live in the boonies and there isn't much competition between the parts houses but $150 is about what pumps go for here in SW Colorado also.
I have a full tank also - rear pumped into the front. Could you point to a thread detailing your procedure for emptying the tank. Would a Haynes give me enough info to figure out which pins to junp, etc.? I tried siphoning - can't get the hose in.
I have a full tank also - rear pumped into the front. Could you point to a thread detailing your procedure for emptying the tank. Would a Haynes give me enough info to figure out which pins to junp, etc.? I tried siphoning - can't get the hose in.
Junior User
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From: Pagosa Spring USA
PS, all you guys who may have the same problem should check out my thread: "NHTSA-dot-gov on Fuel Cross-Flow Problem" posted 2/8. It tells you how to post a complaint at National Highway Transportation Safety Administration's web site (takes two minutes). This will help expand the 90-93 recall to include all the rest of our trucks. It's obvious that Ford will only make their trucks as safe as the government forces them to.
Moderator
Joined: Dec 2001
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From: Louisville,Ky.
Well, I installed the pump (module it is called. It contains the pump and checkvalves). It cured the problem. It no longer pumps into the front tank from the rear and now has over 40lbs of on both tanks. The front one only had about 18lbs before.
To drain the tank, I used my fuel pressure tester. I zip-tied the bleed-off valve open and put the hose into a gascan. I then jumped out relay #2 in the power distribution box under the hood and let the weak pump pump the gas out of the tank for me. It will take a couple of hours to drain it down, but it makes removing the tank a lot easier because it is much lighter.
To drain the tank, I used my fuel pressure tester. I zip-tied the bleed-off valve open and put the hose into a gascan. I then jumped out relay #2 in the power distribution box under the hood and let the weak pump pump the gas out of the tank for me. It will take a couple of hours to drain it down, but it makes removing the tank a lot easier because it is much lighter.
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From: Pagosa Spring USA
LxMan1, thanks for the description. But when you say "pump" to you mean just the pump by itself or the entire Fuel Delivery Module which fits in the tank and contains the pump and a bunch of other plumbing (which I haven't seen yet)? Your answer will make a $100 difference in what I buy for my truck.
Thanks in advance,
Dan in Colorado
Thanks in advance,
Dan in Colorado
Junior User
Joined: Oct 2002
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From: Pagosa Spring USA
I hate to be dense, but... Is the "assembly" just the pump that installs in the thing that lifts out of the tank? Or the pump, the sending unit and various plumbing in the whole thing that lifts out of the tank? I really hate sounding dumb but "assembly" covers a lot of ground.
I'm trying to ask if I need just a pump (the one I saw at Checker is round, maybe 3" across and maybe 11" long, plastic, has a couple of wires coming out of it and a couple of holes in the end of it) or do I need the whole Fuel Delivery Module (haven't seen one of these yet)? I can get a pump for $150; an FDM is $250. I'm trying to just buy the stuff I need to keep fuel from one tank going into the other.
Please be specific: Pump or FDM.
Thanks in advance again,
Dan in Colorado
I'm trying to ask if I need just a pump (the one I saw at Checker is round, maybe 3" across and maybe 11" long, plastic, has a couple of wires coming out of it and a couple of holes in the end of it) or do I need the whole Fuel Delivery Module (haven't seen one of these yet)? I can get a pump for $150; an FDM is $250. I'm trying to just buy the stuff I need to keep fuel from one tank going into the other.
Please be specific: Pump or FDM.
Thanks in advance again,
Dan in Colorado
Last edited by DCC; Feb 9, 2005 at 07:41 PM. Reason: spelling