83 K10. Swapped in a 89 TPI few years back. went with external pump and
resevoir. External fuel pumps just won't last and cost a fortune. I have a
20 gal tank on drivers side long bed. Are the dimensions the same on 87 up
fuel injected tanks. No one that I have found that sells the tanks have
actual dimensions on the two tanks. No problem buying a tank and in tank
pump/sending unit but hate to buy it and it not fit. Anyone know for sure.
Have you tried getting or looking at a tank at a bone yard (no to use if
you wnat a new one but to be able to measure and see it? I am not
surprized about pump failures. That is why they are in the tank because
the fuel cools and lubes then too
They don't need cooled or lubed any more than a typical blower motor. They
are in the tank to make the average do it yourselfer shy away from changing
the pump, thus raising revenues for dealerships. They are also in the tank
so they could jack the price up by 1000 percent by making it some special
part. Its just a cheap electric motor. Lots of people won't run less than
a half tank of gas so they can keep the pump cooled. This is a crock.
Pumps last a long time or they don't - it has nothing to do with keeping
lots of gas in the tank. The one exception, (I would guess) is not to run
the pump with an empty tank.
You are wrong on that, many year ago my dad was involved in bidding on
the motor for that pump on behalf of a manufacture he represented at the
time and he told me all about it long before the first EFI truck
appeared. It uses a specailly designed brushless motor that uses the
gasoline to lube its bearings and to cool the motor as well because it
would get pretty hot without it. (that is the real reason it is in the
tank. Do not take my word for it, run your tank done to "E" an lot and
keep it there and see how long the pumps lasts.
How long should it last? I have a 26 gallon tank on my 99. It almost
always takes me 22 gallons to fill up. My low fuel light comes on almost
every time so I'm running low on every tank of gas I've ever bought. I have
151k miles on it now and I figure that if it quits today, it has served its
time. If a pump lasts for 100k, it was a good one. Maybe my opinion is
wrong - it sure wouldn't be a first! But the fuel pump for my truck is over
300 dollars and I just can't imagine that thing costing that much. It like
the gasoline prices - they charge whatever we will pay.
Running it empty betwwen freqent fill is not bad but keeping it on empty
and only putting is 5 gallons at a time is different. How long should
they las? My 89 4x4 burb has the original pump and it has 175k on it and
it has seen 50 below and over 100 above too. It really is a very
precision motor in them.
From '73-'87 the tank dimensions are the same and the only size
difference was 16gal or 20gal. The only difference was the '87 tank had an
internal baffle specifically designed to keep gas at the fuel pump pick-up.
It is deadly for the fuel pump to run them dry for very long...10-15sec.
'87-'91 Suburbans and full size Blazers have a rear mounted tank of
capacities from 25-40 gal and are TBI ready internally. Find one and get all
the mountings, lines, and electrics and install it...more capacity, better
weight distribution, and like I said, TBI ready!
I have been having real trouble with my in tank fuel pumps and have just
bought an inline pump. I hope to fix my problem this way. I put an 87 350
into an 84 K 3/4 ton. I purchased new pumps from NAPA and have learned to
remove and reassemble the tanks quickly (1/2 day or less.) I have had my
share of problems with fuel flow being impaired. old tank was dirty and
another one was the return line was plugged.
You should think about the return line idea, cause if you didn't have a fuel
return line from the TBI to the tank, the pump would have been putting out
maximum pressure with minimum fuel flow through it. Thus maximum effort
with minimum cooling. The new sending unit for TBI will have a return line
connection and the older sending unit probably doesn't have it.
The new sending unit will work on the old tank, just make sure you get the
sending unit for the correct side. The tanks are the same from side to
side, but the sending units are different.
Peace and good luck.
Thanks for the info. I work away from home and don't have a hell of alot of
time to hit the boneyards and measure. Usually order parts online and have
them waiting when I get home, leaves more time to spend on the creeper.
Little more explanation on what I got. I got a low pressure pump pumping
into a resevoir with a return line out the top of the resevoir going back to
the tank. then out the bottom of the resevoir I have the supply line to my
high pressure pump then a return line back to the resevoir. The high
pressure pumps are over 200 bucks and last about a year. Ive been through 3
pumps 2 diffrent brands. I need the resevoir to keep from fuel starvation.
When I first set up this beast I had problems when accelerating or hill
climbing. The fuel would move away from the pump pickup and immediatly die
since this is a TPI setup. so then I added the 1 gallon aluminum resevoir. I
am wanting a TBI tank only available after 87. That way I can simply put in
a TPI pump in place of the TBI. Shades answered my dimensional questions so
now Its time to call and get a tank and sending unit on the way. Ill stop
by Summit and pick up a pump.
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