FUEL PUMP: 3 PORT OR 2 PORT? January 24, 2025, 08:38:32 pm Hello, I’ve been diagnosing a starting issue with my 2002 LD 30ft IB 6.8l. I swapped filter, regulator, and now that confirms it’s my fuel pump. 20psi running, 0psi when shut off. Have to flick key on/off multiple times to build pressure to start. In other forums, I saw people recommending a three port fuel pump. However I stuck my phone up where I can see my fuel lines and I’m certain I’m only counting two? I’ve verified there’s two other spots that have tapped into the fuel tank. Everything is factory. Those could be return line and evap line? Not sure. Got dark before I could verify. Here is the picture I snapped. The second photo is a picture another user posted of their fuel pump with three ports. I’d hate to order the wrong one. It’s already been tough hunting down an OEM pump but the one I found has two ports, not three. Standing by to order.
Re: FUEL PUMP: 3 PORT OR 2 PORT? Reply #1 – January 25, 2025, 02:43:34 am Quote from: wbraack - January 24, 2025, 08:38:32 pmHello, I’ve been diagnosing a starting issue with my 2002 LD 30ft IB 6.8l. I swapped filter, regulator, and now that confirms it’s my fuel pump. 20psi running, 0psi when shut off. Have to flick key on/off multiple times to build pressure to start. In other forums, I saw people recommending a three port fuel pump. However I stuck my phone up where I can see my fuel lines and I’m certain I’m only counting two? I’ve verified there’s two other spots that have tapped into the fuel tank. Everything is factory. Those could be return line and evap line? Not sure. Got dark before I could verify. Here is the picture I snapped. The second photo is a picture another user posted of their fuel pump with three ports. I’d hate to order the wrong one. It’s already been tough hunting down an OEM pump but the one I found has two ports, not three. Standing by to order. I ordered a cheap borescope so I can get a closer look to be 100% sure. Can’t get a good angle with my phone to check for a hidden third fuel port I could be missing. Besides, I needed one to inspect plumbing in tight inaccessible areas.
Re: FUEL PUMP: 3 PORT OR 2 PORT? Reply #2 – January 25, 2025, 03:11:48 am Hi WBraack; Pretty sure you need a three port. The Larry Wade Project accessed by the link on our main 'banner' page has a collection of photos from when he replaced his own. The Search function, under "Community",(previous posts archive) would also yield more information about the correct configuration and number of ports. Failures of the fuel pump are usually the pump doesn't pump at all, or can't provide enough fuel when the engine is under full load. So you have a pressure gauge on the fuel rail? Test port at the front IIRC? Does the pressure ever get up to 40 psi? There is a fuel filter sock around the pickup in the tank that could be fouled up also. RonB a link: Fuel pump replacement | Flickr 2 Likes
Re: FUEL PUMP: 3 PORT OR 2 PORT? Reply #3 – January 25, 2025, 10:50:43 am You need 3. One is to send fuel to the engine, one is to return fuel from the engine, and the third is for the generator. If you don't know about the cracked fuel hose issue for the generator fuel line, make sure you read about it and replace the problem section of fuel hose before putting everything back together. Recommend a quality brand (I used Motorcraft) if you don't want to do the job twice.Rich 4 Likes
Re: FUEL PUMP: 3 PORT OR 2 PORT? Reply #4 – January 26, 2025, 12:41:32 pm You definitely need a three port fuel pump, BTDTWatching the rain at the beach, the first we have seen in many months.Larry 1 Likes
Re: FUEL PUMP: 3 PORT OR 2 PORT? Reply #5 – January 26, 2025, 03:27:50 pm Quote from: RonB - January 25, 2025, 03:11:48 amHi WBraack; Pretty sure you need a three port. The Larry Wade Project accessed by the link on our main 'banner' page has a collection of photos from when he replaced his own. The Search function, under "Community",(previous posts archive) would also yield more information about the correct configuration and number of ports. Failures of the fuel pump are usually the pump doesn't pump at all, or can't provide enough fuel when the engine is under full load. So you have a pressure gauge on the fuel rail? Test port at the front IIRC? Does the pressure ever get up to 40 psi? There is a fuel filter sock around the pickup in the tank that could be fouled up also. RonB a link: Fuel pump replacement | FlickrI just verified the third fuel port with a borescope before checking back here. It definitely was hidden between the two from the two angles I was able to see it from. From other angles the various electrical looms or fuel lines inhibited me from seeing this third port. I appreciate your response as well as the others here. I’m kicking myself from filling my tank full before returning home from the last trip. I don’t have a 55gal drum or bladder to drain the tank. I’ll need to drive it and return on E. I did hook up a fuel pressure guage. This was after I replaced the fuel filter. 0psi on off, hardly built any pressure on prime and immediately loses it, if I turn key off/on I I somewhat pressurize to 10psi. It will immediately lose this pressure if I wait even a second before starting. If started, it pressurizes to only 20, sometimes up to 25. Did not verify pressure while driving. If I turn it off after running, pressure is immediately lost. I replaced the fuel regulator behind the dog house and unfortunately that did not fix the issue nor make it any better. Looks like the fuel pump check valve has gone bad. To my understanding it is integrated in the actual fuel pump inside the sending assembly. I would bet your on the money about a clogged filter in the tank too- this rig sat for sometime. Only driven 58k miles since 2002- 115 hours on genny. My only issue now is trying to source a three port OEM fuel pump complete assembly or finding a trust worthy brand in lieu of OEM. However- I was thinking I could just buy the two port OEM pump assembly (in the $250-350 range). I can disassemble that and swap all the parts to my three port assembly. Getting shopping today for a three port completely assembly and hoping I find one somewhere.
Re: FUEL PUMP: 3 PORT OR 2 PORT? Reply #6 – January 26, 2025, 04:27:06 pm More informationFuel pump replacement | FlickrLarry
Re: FUEL PUMP: 3 PORT OR 2 PORT? Reply #7 – January 26, 2025, 04:43:42 pm Quote from: wbraack - January 26, 2025, 03:27:50 pm"My only issue now is trying to source a three port OEM fuel pump complete assembly or finding a trust worthy brand in lieu of OEM. However- I was thinking I could just buy the two port OEM pump assembly (in the $250-350 range). I can disassemble that and swap all the parts to my three port assembly. Getting shopping today for a three port completely assembly and hoping I find one somewhere."Call me cautious. WHY would you buy the incorrect part and try to modify it???!Rock Auto shows a Delphi 3 port pump; I do believe that is a quality item; I seem to recall that was what my servicing shop used on our 2003. Take your time and do it right since it sounds like you made it home with the defective pump.And good luck returning a modified part when if that plan goes awry. Just saying....Steve K 1 Likes
Re: FUEL PUMP: 3 PORT OR 2 PORT? Reply #8 – January 26, 2025, 05:32:14 pm Quote from: Steve K. - January 26, 2025, 04:43:42 pmCall me cautious. WHY would you buy the incorrect part and try to modify it???!Rock Auto shows a Delphi 3 port pump; I do believe that is a quality item; I seem to recall that was what my servicing shop used on our 2003. Take your time and do it right since it sounds like you made it home with the defective pump.And good luck returning a modified part when if plan goes awry. Just saying....Steve KI’m rather mechanically inclined. They sell the pumps standalone as you see when you look up this. In other lazydaze forums and other mechanic forums, people clearly outline that you can either swap the components of a good assembly out or purchase an entire assembly with pump. I happen to do this exact thing for a rarer motorcycle fuel pump on an 03-04 Kawasaki. The complete assemblies are $400-500 and fail often. I know my way around fuel pump rebuilds. I’ve taken two fuel pumps and changed components around to make a nearly new fuel pump from the two. It is not a redneck modification. It is simply taking the identical components from a two port pump and installing them in a three port assembly. The only difference between the two assembly is a third pickup tube for the generator. This could still be circumnavigated by installing a two port pump, then drilling the tank and installing a dedicated generator pickup. That’s exactly how the evap port on the tank is installed. This is the exact thing you would do when installing a pickup in a Mercedes sprinter or ford transit van for a diesel or gasoline heater. No different than how a professional would install such an item. There’s many ways to professionally accomplish the same goal here without rednecking this… This is just not something I’d recommend to someone that doesn’t know their way around a vehicle. For those folks, it’s best they stick to paying mechanics or buying a three port complete assembly that will be a plug and play swap. Anyways, it doesn’t matter. Autozone ended up having the fuel pump with three ports. It doesn’t come up under an e450 but rather the e350 w/ 6.8l v10. I took the pictures linked in the flickr album and compared the pumps. Not only are they physically identical, they have the same serial numbers, and same fuel pressure ratings. I heeded everyone’s warnings out using aftermarket pumps. I wanted strictly OEM ford or motocraft. Thanks, hope this forum helps the next guy out.
Re: FUEL PUMP: 3 PORT OR 2 PORT? Reply #9 – January 26, 2025, 08:00:38 pm Our LD spun a pinion shaft bearing in the rear axle several years ago. It made a strange noise that came and went.The fuel tank blocked access to the rear of the axle and with a little over 100,000 miles on the rig, dropping the tank and changing the fuel pump made sense. I found what seemed to be the last Ford fuel pump available for our 2003 LD.If the pump needed changing today, I would buy the 3-tube Delphi, it's the best available now.If doing this, change all the emission and fuel lines at the same time while they are accessible. Pulling the tank is a job you will only want to do once.Axle rebuild.Axle rebuild-D70 HD | FlickrLarry 2 Likes
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