Advice/Help Needed - 1988 Dodge Dakota 3.9 V6 - Fuel Pump Assembly Replacement
#1
Advice/Help Needed - 1988 Dodge Dakota 3.9 V6 - Fuel Pump Assembly Replacement
Hi,
I recently purchased a 1988 Dodge Dakota that is in need of a new fuel pump/sending unit assembly. The original pump/sending unit assembly (P/N: 4203884) has rusted beyond repair.
I've attempted to find a replacement for this fuel pump/sending unit assembly online, but I have been unsuccessful.
I have been able to track down aftermarket fuel pump/sending unit assemblies for 1991 to 1996 Dakotas. Would an assembly from these years fit the fuel tank of my 1988 Dodge Dakota? Both use five pin electrical connectors, albeit different types, though I would assume I'd be able to rewire the connector for the new assembly.
The plastic on the rollover valve (the bottom connector in the first picture) has broken off, but it seems as if this is part of the EVAP system and not required. Could someone confirm this? I am located in Georgia where emissions are not mandated.
Thanks in advance.
Fuel Pump Assembly Connections
Removing Fuel Pump Assembly from Fuel Tank
Rusted Fuel Sending Unit
Fuel Pump Assembly Removed from Tank
Fuel Pump Assembly Removed from Tank
Fuel Pump Assembly Removed from Tank
I recently purchased a 1988 Dodge Dakota that is in need of a new fuel pump/sending unit assembly. The original pump/sending unit assembly (P/N: 4203884) has rusted beyond repair.
I've attempted to find a replacement for this fuel pump/sending unit assembly online, but I have been unsuccessful.
I have been able to track down aftermarket fuel pump/sending unit assemblies for 1991 to 1996 Dakotas. Would an assembly from these years fit the fuel tank of my 1988 Dodge Dakota? Both use five pin electrical connectors, albeit different types, though I would assume I'd be able to rewire the connector for the new assembly.
The plastic on the rollover valve (the bottom connector in the first picture) has broken off, but it seems as if this is part of the EVAP system and not required. Could someone confirm this? I am located in Georgia where emissions are not mandated.
Thanks in advance.
Fuel Pump Assembly Connections
Removing Fuel Pump Assembly from Fuel Tank
Rusted Fuel Sending Unit
Fuel Pump Assembly Removed from Tank
Fuel Pump Assembly Removed from Tank
Fuel Pump Assembly Removed from Tank
Last edited by Alexander Buck; 08-20-2020 at 02:36 PM. Reason: Added additional information.
The following users liked this post:
RalphP (08-19-2020)
#2
Rock Auto has a fuel pump. In the FAQ section there is a thread where someone rebuilt their sending unit. I do not remember what year pump assembly it was.
here ya gohttps://dodgeforum.com/forum/1st-gen-dakota-tech/269286-diy-fuel-pump-or-fuel-gauge-trouble-shooting-no-dial-up-friendly.html
here ya gohttps://dodgeforum.com/forum/1st-gen-dakota-tech/269286-diy-fuel-pump-or-fuel-gauge-trouble-shooting-no-dial-up-friendly.html
Last edited by onemore94dak; 08-19-2020 at 01:39 PM.
The following users liked this post:
Alexander Buck (08-20-2020)
#3
Hi,
I recently purchased a 1988 Dodge Dakota that is in need of a new fuel pump/sending unit assembly as the original assembly has rusted beyond repair. I could probably get the pump to work, but the sending unit is completely shot.
After searching online, it's become clear that I will not be able to track down an exact replacement for the original assembly. P/N: 4203884
I've been able to track down aftermarket fuel pump/sending unit assemblies for 1991 to 1996 Dakotas. Would these assemblies fit the fuel tank on the truck? Both use five pin electrical plugs with the exception of the old plug being circular and the newer plug being rectangular, so I'd assume I could rewire the new plug.
Thanks in advance.
I recently purchased a 1988 Dodge Dakota that is in need of a new fuel pump/sending unit assembly as the original assembly has rusted beyond repair. I could probably get the pump to work, but the sending unit is completely shot.
After searching online, it's become clear that I will not be able to track down an exact replacement for the original assembly. P/N: 4203884
I've been able to track down aftermarket fuel pump/sending unit assemblies for 1991 to 1996 Dakotas. Would these assemblies fit the fuel tank on the truck? Both use five pin electrical plugs with the exception of the old plug being circular and the newer plug being rectangular, so I'd assume I could rewire the new plug.
Thanks in advance.
OTOH, you can find used 91-96 tanks in the boneyard sometimes; my master plan is to order a 22 gallon one from a 91-95 or 96, then swap my tank and fuel pump assembly out for the later one.
And then store a quality one on the shelf along with putting a new one in the truck.
I'm not sure what else will need to be changed; I THINK the filler neck; and I'll have to replumb the hoses a bit (need to use a 91-93 V6/V8 pump, or a 91-95 I4 pump, to get the return fuel system, for instance.)
RwP
The following users liked this post:
Alexander Buck (08-20-2020)
#4
Rock Auto has a fuel pump. In the FAQ section there is a thread where someone rebuilt their sending unit. I do not remember what year pump assembly it was.
here ya gohttps://dodgeforum.com/forum/1st-gen-dakota-tech/269286-diy-fuel-pump-or-fuel-gauge-trouble-shooting-no-dial-up-friendly.html
here ya gohttps://dodgeforum.com/forum/1st-gen-dakota-tech/269286-diy-fuel-pump-or-fuel-gauge-trouble-shooting-no-dial-up-friendly.html
The problem is that where they fasten to the tank is a completely different design and the tank is completely different.
OTOH, you can find used 91-96 tanks in the boneyard sometimes; my master plan is to order a 22 gallon one from a 91-95 or 96, then swap my tank and fuel pump assembly out for the later one.
And then store a quality one on the shelf along with putting a new one in the truck.
I'm not sure what else will need to be changed; I THINK the filler neck; and I'll have to replumb the hoses a bit (need to use a 91-93 V6/V8 pump, or a 91-95 I4 pump, to get the return fuel system, for instance.)
RwP
OTOH, you can find used 91-96 tanks in the boneyard sometimes; my master plan is to order a 22 gallon one from a 91-95 or 96, then swap my tank and fuel pump assembly out for the later one.
And then store a quality one on the shelf along with putting a new one in the truck.
I'm not sure what else will need to be changed; I THINK the filler neck; and I'll have to replumb the hoses a bit (need to use a 91-93 V6/V8 pump, or a 91-95 I4 pump, to get the return fuel system, for instance.)
RwP
I could probably get the pump to work with the original assembly, but the sending unit is the main issue. I've seen universal aftermarket sending units, and I am considering cutting a hole in the tank and installing a standalone unit rather than using the original assembly for both the pump and sending unit.
The plastic on the rollover valve (smaller outlet, circled in red) has broken off, but it seems as if this is part of the EVAP system and not required. Could someone confirm this? I am located in Georgia where emissions are not mandated. What is the larger outlet connected to? I can't seem to find a hose that goes to it.
Fuel Pump Assembly Connections
Last edited by Alexander Buck; 08-20-2020 at 05:20 PM.
#6
As you said, 1991 and newer assemblies are available, and in that case, I'll search around for a fuel tank. I've found a website with fuel tanks for sale.
As for the rollover valve, it's possible there may not be a connection on the larger flange and it could have been capped off for the 1988 models, but for future reference, here's a picture from the fuel pump rebuild thread that shows the hoses connected on a 1993 Dodge Dakota.
Rollover Valve Connections
#7
The 1993 is a different fuel pump assembly; I don't know where that goes.
Do notice the plastic ring that holds the fuel pump in place on the 1993; that's why we can't just drop it into our 1988s. Well, that, and a few plumbing changes ...
The small end goes to the fuel vapor line up to the carbon canister up by the radiator.
There IS one nice thing about our fuel pumps; there's a "DRAIN" fitting you can connect a pump to and suck the fuel out if you have to. Truck will run fine without it.
RwP
Do notice the plastic ring that holds the fuel pump in place on the 1993; that's why we can't just drop it into our 1988s. Well, that, and a few plumbing changes ...
The small end goes to the fuel vapor line up to the carbon canister up by the radiator.
There IS one nice thing about our fuel pumps; there's a "DRAIN" fitting you can connect a pump to and suck the fuel out if you have to. Truck will run fine without it.
RwP