GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.
Home » Public Forums » GMCnet » [GMCnet] Found Fuel Starving Problem
[GMCnet] Found Fuel Starving Problem [message #141501] Mon, 29 August 2011 09:41 Go to previous message
Ray Erspamer is currently offline  Ray Erspamer   United States
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma:
Senior Member
Good Morning

This past weekend I decided to drop my fuel tanks. I've been dealing with a
fuel starvation problem at highway speed, when I would step on the accelerator
to pass someone or to climb a hill I would get missing & hesitation.

I discussed this with Dick Patterson because I thought it may have been an
ignition issue and he was certain it was a fuel problem.

On the trip out of town for our last outing, we ended up getting towed home
because the engine quit completely and wouldn't restart. After analyzing things
I discovered that the engine was getting no fuel. I worked my way back toward
the tanks disconnecting the fuel line at various points, dry as a bone. I
disconnected the line from the main tank to the tank selector valve and it was
dry, I blew in it, felt a restriction which quickly cleared and gas came pouring
out. I then disconnected the auxiliary tank line, it also was dry, however when
I blew in it all I could hear was air going into the tank.......I thought that
was strange because both tanks were full !


With the lines clear the engine immediately started and we enjoyed out trip, but
I still had hesitation while trying to accelerate at faster speeds.

When I dropped the tanks this weekend I discovered several things:
1. My tanks were pristine ! No rust what-so-ever. No goo, no crud, no
nothing.
2. The socks, pickup tubes, gage sending units were all EXTREMELY clean.
3. All hoses were tight and soft, no cracks or deterioration. I still replaced
all hoses and SS clamps anyway.
4. It was obvious that these tanks had been removed a short time before my
ownership.
5. Now....PROBLEM ONE - On the auxiliary tank, the FUEL LINE was connected to
the VENT PORT on the tank pick up. No wonder when I blew in it I heard air
going into the tank.

6. PROBLEM TWO which I think was my fuel starvation issue and the potential
blockage that occurred. The sock on the main tank pickup tube was bent tight in
half inside the tank. That meant that instead of having the entire area of the
sock for picking up fuel, there was about 1 square inch at most available.

After I reinstalled the tanks I added 5 gallons of gas and then went to a gas
station and filled up. Went for a long test ride and wow, it performed
fantastic.

Another detail that someone missed when reassembling the tank pickup units that
can cause real headache's after time.

See the attached pictures.

http://tinyurl.com/3myqzzb

http://www.gmcmhphotos.com/photos/showphoto.php?photo=40401&title=fuel-tank-removal-8-27&cat=5865



Ray


Ray & Lisa Erspamer
78 Royale "Great Lakes Eagle"
Center Kitchen TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

Ray Erspamer 78 GMC Royale Center Kitchen 403, 3.70 Final Drive Holley Sniper Quadrajet EFI System, Holley Hyperspark Ignition System 414-484-9431

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: SELLING OUR 1974 GMC ELEGANZA
Next Topic: [GMCnet] KROIL / ATF - and rusted bolts
Goto Forum:
  


Current Time: Fri Feb 07 11:14:42 CST 2025

Total time taken to generate the page: 0.01265 seconds
.:: Contact :: Home ::.

Powered by: FUDforum 3.1.1.
Copyright ©2001-2021 FUDforum Bulletin Board Software