What is the purpose? (Page 1/2)
weaselbeak JUL 10, 04:35 PM
I've been dealing with a nightmare fuel pump situation on a Blazer. To make it short, this particular Blazer takes a one off fuel pump that runs well north of 300 bucks. To add insult to injury, you can learn some new english removing and installing this particular gas tank. I say this because I don't need lectures about changing the system. I made a fuel pickup and return system to replace the in tank pump. I then went with an in line pump. 700 dollars worth of fuel pumps in less than 2 years, and the resulting work involved will lead one to alternative measures. It all works great. A Bosch pump good for 90-100 psi, set at the 62 psi I need. I have a really good ground. These pumps, while a 10 minute job to change, are only good for a couple weeks and they sieze up. I have fuel flowing thru for cooling issues. I'm thinking MAYBE there isn't enough volume, meaning not enough fuel flowing back to the tank, to keep it cool enough. Or maybe 62 psi is asking too much on a continual basis. It's a work in progress because it grates me no end to fork over 350 bucks for a factory style pump I can't trust. I see that Mercedes has a system that uses 2 inline pumps. So I am curious as to why Mercedes would go this route. More flow? Less strain on each individual pump?
rogergarrison JUL 10, 06:09 PM
I had to replace a Cavalier fuel pump. My cost was over $500...so yours is cheap. Does the fuel gauge also work off of yours. If not, there should be a way to install an aftermarket pump outside the tank. My Mercedes has the fuel pump on the frame rail under the gas tank. A hose just runs from the bottom of the tank into the inlet. The pump and fuel filter are both there and pump thru a hard line up to the engine alongside the brake lines.

[This message has been edited by rogergarrison (edited 07-10-2012).]

weaselbeak JUL 10, 07:40 PM
That is exactly how this is now set up, except my pickup exits the top of the tank. The pump is well below the tank. I put an aftermarket fuel gauge on it from a marine application, no trouble tho. Maybe I just need a higher rated pump, say 100-120 psi, it would/should be less strained? I have vapor locking in the back of my mind, but I studied the engineering principles involved and line sizes, etc. are what they should be.
jetsnvettes2000 JUL 10, 09:00 PM
I have a left over pump from my bravada they sent me with the wrong plug end for it, its a 97 bravada maybe it will fit yours? got pics of it? pm me it does me no good sittin on shelf in box.
nmw75 JUL 10, 09:10 PM
I dont understand why GM pumps are so expensive? Especially since they're known to go.
Had to replace one in an S-10. $350 at dealer cost. Luckily it was a simple replacement. just took the bed off to access the top of the tank.
If my Sierra ever needs one I'm looking at $450

Your sure that your not sucking air somehow?
NJD85GT JUL 11, 12:02 AM

quote
Originally posted by nmw75:

I dont understand why GM pumps are so expensive? Especially since they're known to go.
Had to replace one in an S-10. $350 at dealer cost.



Tell me about it, when my pump was going in my '97 S-10 4.3L the dealer wanted $600 for just the pump and $1,200 installed! I found a good pump online for $250 and had a shop change it out for another $100 or so.

Nate
weaselbeak JUL 11, 12:10 AM

quote
Originally posted by jetsnvettes2000:

I have a left over pump from my bravada they sent me with the wrong plug end for it, its a 97 bravada maybe it will fit yours? got pics of it? pm me it does me no good sittin on shelf in box.



There is a difference between the 2 door I have, and the 4 door. Different fuel tanks. But it doesn't really matter now, as I have taken on this project of changing the system. I'm really not wanting another stock fuel pump as I do not trust it to get very far from home. At least my way I can change it out on the side of the road in minutes. I'm just trying to figure out whether I have an inherent problem or just crap for pumps. If I knew for sure my system is OK, I'd spring for one of those really pricey in line pumps. And a cheap spare would give me great piece of mind.

[This message has been edited by weaselbeak (edited 07-11-2012).]

Justinbart JUL 11, 10:44 AM
I put a TRE 255 pump in my '00 blazer. It fits in the canister just like the original. Cost me $70 and still running strong.

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Turbo 3800 E85 F23 5spd spec5
11.54@132.7

weaselbeak JUL 11, 10:57 AM
I'll look into that, out of curiousity.
jaskispyder JUL 12, 02:51 PM
could you be having an electrical problem.... maybe the pumps are running on too low of voltage?