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Old 07-12-2010, 01:00 AM   #1
Nyulak
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Default Fuel Pump Replacement SItuation

My car decided to not run smoothly last March, due to timing and money, I wasn't able to really look into it until recently. At first my car felt a little underpowered, but then it got to the point where it didn't really want to go beyond 40 MPH even when holding the throttle to the floor. This coincidentally started after I miss-shifted when passing a vehicle, so I thought maybe I did some valve train damage.

Valve cover off showed everything okay, some quick listening to the top end revealed no clatter, and the valve lashing was good enough. Looking at the front of the engine showed all timing marks aligned and a nice looking timing belt. Reading in my Bentley about fuel pumps, I was given an idea.

Since my car is an '87, I have two fuel pumps; there is a transfer pump in the fuel tank and the the external fuel pump near the fuel filter. I removed the transfer pump, jumpered the relay, and got no response from the transfer pump, but the external pump sprung to life. Complete removal of the transfer pump followed and additional bench testing was performed. Neither a 12 Volt supply nor a car charger/starter would get the pump moving. The motor itself could be spun with air, but the motor windings themselves are shot.

Well, I am now in the market for a fuel pump, but I read on these forums about some aftermarket alternatives. I was wondering if it would be worth my while to create a single pump setup with Walbro, Bosch, or TRE in-tank pump, or if I should get an equivalent TRE in-tank pump. Any suggestions?

Thanx!
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Old 07-12-2010, 01:38 AM   #2
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you can do walbro 255 in tank no problem...there is even a write up for that
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Old 07-12-2010, 02:03 AM   #3
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Originally Posted by E30Dallas View Post
you can do walbro 255 in tank no problem...there is even a write up for that
http://www.r3vlimited.com/board/showthread.php?t=134915
thats what I plan on doing
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Old 07-12-2010, 06:46 AM   #4
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Do a compression test. How do you expect to see bent valves from the top?
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Old 07-12-2010, 08:02 AM   #5
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Bent valves would be noisy, especially without the cover and my standing next to the valve train with the engine running. I wouldn't have completely ruled it out if the fuel pump worked, but since it clearly doesn't work and the symptoms fit, I'm going for the low hanging fruit.

I saw the writeup during my searches over the weekend, but would I still use the external pump? It would seem the bigger in tank unit would mean I could get rid of the external unit. Is this true?
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Old 07-12-2010, 11:35 PM   #6
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wouldn't a 255lph be a little excessive for a close to stock vehicle? sounds like a waste of gas.
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Old 07-13-2010, 01:16 AM   #7
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Geez dude. The unused fuel gets returned to the tank. No issues there.
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Old 07-13-2010, 01:33 AM   #8
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the walbro and tre are basically the same i believe.. i heard the tre one is quieter though.. dunno the truth behind it cause i never experienced both.. but i went with the tre one.. youll have to cut out the bottom of the metal bracket that holds the pump and solder the new wiring harness in.. only modifications youll have to make.. this is the one i did recently.. sorry for the huge pic
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Old 07-13-2010, 09:40 AM   #9
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Thanx for the information and picture! I ordered the TRE unit and will hopefully get it soon to install this weekend.
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Old 07-13-2010, 09:43 AM   #10
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I oredered the oem just to be safe, but I'm a nerd like that you should be good with the TRE. Also, replace your fuel filter while your at it, and check fuel lines to be safe.
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