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Old 01-07-2017, 03:02 PM
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Fuel Pump Questions

So after getting low pressure from my pump at key on - and showing zero psi at key on first thing in the morning when it is frigid, I have reason to believe I have a fuel pump that is seizing up.

Now I'm looking for a replacement bosch pump so I can swap it out but I have a few questions that I am surprised I couldn't find in about 10 pages of reading and the search bar.

There seems to be pumps and pump assemblies- what is included with the pump assemblies that is different than obviously just the pump? Is that fuel pressure regulators and filters and strainers type of deal as well?

secondly, there seems to be 2 options for my vehicle- 15 gallon and a 19 gallon pump- I believe I have a 15 gallon as I typically put about 14 gallons in when the fuel light comes on... but is there a difference between the 2 pumps?

The 19 gallon seems to be less expensive - is there harm to installing that if I have a 15 gallon tank?

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Old 01-07-2017, 03:51 PM   #2
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I'm sure others may differ, but I recommend the whole assembly. It includes the pump assembled with hoses, electrical, strainer, sending unit for fuel level, etc. I think it's the easier way to go. I'm not sure what the price difference is. If your pump is bad who knows if some of those other parts will also go bad soon.

The 15 and 19 are different. the assembly installs from the top of the fuel tank. The pump draws fuel from the bottom of the tank, so it must reach the bottom. The two tanks are different heights, hence the different part numbers.

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Old 01-07-2017, 04:00 PM   #3
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The 2 pumps are basically the same. If you have a 99 Sahara then you have the 19 gallon tank. The 15 gallon tank is really a 19 gallon tank that is restricted from filling all of the way up, so the sending unit on the 15 gallon pump will read different.
If you did have the 15 gallon tank, it only takes a minute to make it take the full 19 gallons once you have it off of the jeep
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Old 01-07-2017, 04:03 PM   #4
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The 2 pumps are basically the same. If you have a 99 Sahara then you have the 19 gallon tank. The 15 gallon tank is really a 19 gallon tank that is restricted from filling all of the way up, so the sending unit on the 15 gallon pump will read different.
If you did have the 15 gallon tank, it only takes a minute to make it take the full 19 gallons once you have it off of the jeep
Shoe are the tanks the exact same dimensions?

What's the purpose of the restrictor?

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Old 01-07-2017, 06:55 PM
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does anyone know how to tell what type of tank you have? I found another thread that said a number of the Canadian TJ's came with 15 gallon tanks as opposed to the 19's. I have no problem snagging a 19 gallon pump and cutting the hose (I read about on a thread about modding the size) but I obviously don't want to cut the hose back too much ...or is it if there is just 1.5" of hose showing inside that means I have the 19 gallon tank?
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Old 01-07-2017, 06:58 PM
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Shoe are the tanks the exact same dimensions?

What's the purpose of the restrictor?

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from what I read in another thread, the restrictor was so that they could "upsell" you a bigger tank for more money in an "upgraded" option but it cost them pennies and a different sending unit to make the change. The sending unit just being so it reads correctly...where as if say I have the 15 gallon tank and I cut the hose, install a 19 gallon pump and don't change the sending unit... my gauge will read "full" until I burn through that extra 4 gallons of gas

now question is where is the sending unit- or is that the difference between the 15 and 19 gallon pumps? lol
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Old 01-07-2017, 08:50 PM   #7
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They used to make 2 different sized tanks, but to save money they started using the same tank for both and restricted the capacity of the 15 gal tank by inserting the vent hose farther down into the tank. This way they could still sell the 19 gal tank as an upgrade. To open up the 15 gal tank to hold the full 19 gallons you just have to cut the vent hose inside the tank. (There are two hoses in the tank; a larger filler hose and a smaller vent hose. Don't cut the filler hose!)
If you use the 15 gal pump, it will read full until the tank gets down to less than 15 gallons, then it reads normally.
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Old 01-07-2017, 08:52 PM   #8
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The pumps are the same for both sizes, only the sending unit is different.
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Old 01-07-2017, 10:20 PM   #9
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Quote:
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from what I read in another thread, the restrictor was so that they could "upsell" you a bigger tank for more money in an "upgraded" option but it cost them pennies and a different sending unit to make the change. The sending unit just being so it reads correctly...where as if say I have the 15 gallon tank and I cut the hose, install a 19 gallon pump and don't change the sending unit... my gauge will read "full" until I burn through that extra 4 gallons of gas

now question is where is the sending unit- or is that the difference between the 15 and 19 gallon pumps? lol
If you purchase the complete fuel pump assembly the sending unit is an integral part of the assembly. Best option for you is to just purchase the 19 gallon unit. If for some reason you have the 15 gallon pump (which I doubt) just cut the vent as suggested above. Either way the tank has to be dropped and the pump removed. The sending unit will be marked 15 or 19 gallons.

On a side note, you stated that this is happening with fridgid temps. Is that only when it happens or just this time. The reason I ask is because I am just wondering if you might have excessive water in your tank which can settle out overnight and freeze.
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Old 01-08-2017, 02:02 PM
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If you purchase the complete fuel pump assembly the sending unit is an integral part of the assembly. Best option for you is to just purchase the 19 gallon unit. If for some reason you have the 15 gallon pump (which I doubt) just cut the vent as suggested above. Either way the tank has to be dropped and the pump removed. The sending unit will be marked 15 or 19 gallons.

On a side note, you stated that this is happening with fridgid temps. Is that only when it happens or just this time. The reason I ask is because I am just wondering if you might have excessive water in your tank which can settle out overnight and freeze.
Well I want to say from about 5*C (41F) and below it happens with is a few degrees above freezing, but ya only in the cold and first thing when you start it after it has sat for 8 hours or so

I may just go grab some heet from the store today and see if that fixes it any and I'll place the order for the 19 gallon pump today


So the sending unit is contained within the entire assemblies? So for example this Bosch pump 2323-09020726 on partsgeek: http://www.partsgeek.com/catalog/199...ml?brand=bosch

Would have everything the sending unit, fuel filter, strainer etc...everything I need?

or the 67655 Bosch pump on rock auto? http://www.rockauto.com/en/catalog/j...ng.com+URL+%2F
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Old 01-08-2017, 03:19 PM   #11
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Well I want to say from about 5*C (41F) and below it happens with is a few degrees above freezing, but ya only in the cold and first thing when you start it after it has sat for 8 hours or so

I may just go grab some heet from the store today and see if that fixes it any and I'll place the order for the 19 gallon pump today


So the sending unit is contained within the entire assemblies? So for example this Bosch pump 2323-09020726 on partsgeek: 99 1999 Jeep Wrangler Fuel Pump - Fuel Delivery - Bosch - PartsGeek

Would have everything the sending unit, fuel filter, strainer etc...everything I need?

or the 67655 Bosch pump on rock auto? 1999 JEEP WRANGLER 4.0L L6 Fuel Pump | RockAuto
As long as what you purchase says "Fuel Pump Module Assembly" it will include everything you need, fully assembled and ready to drop in.

And yes some Heet or dry gas may be the ticket.
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Old 01-08-2017, 03:57 PM
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I got some stuff from STP that was suppose to remove water and dumped that in, couldn't find heet or dry gas anywhere...parts suck here north of the border...I priced out the fuel pump here at the Parts store and they want $480 for it- it's such a monopoly and highway robbery it's disgusting...meanwhile rockauto will ship it to my house for $220 just rattles me...this is why I buy all my parts in the USA for the most part is Canada just completely blows for having everything monopolized
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Old 01-09-2017, 06:37 AM   #13
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Get your Build Sheet it'll list your tank size...

http://www.jeep.com/webselfservice/j...527R%2527%2529

On left side click equipment listing and enter VIN.
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Old 01-09-2017, 06:12 PM
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Interesting...guess I do have the 19 gallon tank...Guess I have atleast another 5 gallons after the light goes on in the Jeep after all...

How do you guys that change your fuel pumps clean your tanks out?
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Old 01-09-2017, 06:49 PM   #15
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Interesting...guess I do have the 19 gallon tank...Guess I have atleast another 5 gallons after the light goes on in the Jeep after all...

How do you guys that change your fuel pumps clean your tanks out?
Very common that your gage does that, the tank in my 99 was spotless when I changed my pump.
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Old 01-09-2017, 11:42 PM
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it would be nice if it is, but if it isn't what do you guys clean them with?
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Old 01-10-2017, 09:57 AM   #17
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My 99 TJ same issue, ivecreplaced the pump twice.

Most important, run the tank as low as you can. For me, the hardest part is those dang electrical connections...

Buy a Bosch.
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Old 01-17-2017, 06:59 PM
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what does a new filter screen look like? My bosch pump came in today and the instructions say that a new filter screen is required and sold separately?

I thought I ordered the whole assembly and am confused on what this looks like?

Also- is there anywhere on the pump that it would be stamped to verify that it is a 19 gallon pump?
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Old 01-17-2017, 07:25 PM   #19
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what does a new filter screen look like? My bosch pump came in today and the instructions say that a new filter screen is required and sold separately?

I thought I ordered the whole assembly and am confused on what this looks like?

Also- is there anywhere on the pump that it would be stamped to verify that it is a 19 gallon pump?
That seem odd as I have replaced several pumps and it was always included. There should be a removeable fuel screen on the base where the pump sits on the bottom of the tank.

Should look something like this:
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Old 01-18-2017, 09:43 PM
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I thought that was the screen- that piece is on the new pump so maybe they just included generic instructions whether you bought an assembled unit or just the pump on it's own.

I still don't see anywhere on it indicating it is a 19 gallon pump
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Old 01-18-2017, 10:30 PM   #21
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I thought that was the screen- that piece is on the new pump so maybe they just included generic instructions whether you bought an assembled unit or just the pump on it's own.

I still don't see anywhere on it indicating it is a 19 gallon pump
On mine it was printed on the float level circuit board.

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